Publication Search

Lead (Pb²⁺) is a hazardous heavy metal commonly found in industrial wastewater and poses serious risks to human health and the environment due to its toxic and non-biodegradable nature. Therefore, an effective and environmentally friendly treatment method is required to reduce Pb²⁺ concentration in wastewater. This study aimed to evaluate the effect of pH and initial Pb²⁺ concentration on the adsorption capacity of ramie leaf (Boehmeria nivea) bioadsorbent activated with NaOH. The adsorption process was conducted using a batch system with pH variations of 4, 5, and 7 and initial Pb²⁺ concentrations of 20, 25, and 30 mg/L. The residual Pb²⁺ concentration was analyzed using Atomic Absorption Spectrophotometry (AAS), and the adsorption performance was evaluated based on removal efficiency and adsorption capacity (Qe). The results showed that pH and initial Pb²⁺ concentration significantly affected the adsorption performance. The optimum adsorption condition was obtained at pH 5, with a maximum removal efficiency of 99.20% and a total adsorption capacity of 18.56 mg/g. The increase in pH from 4 to 5 enhanced adsorption performance due to reduced competition between H⁺ and Pb²⁺ ions for active sites on the adsorbent surface. Increasing the initial Pb²⁺ concentration tended to increase adsorption capacity, although removal efficiency remained relatively stable due to the limited number of active adsorption sites. The Relative Standard Deviation (RSD) values ranged from 1.56% to 3.37%, indicating good precision and repeatability of the experimental data. These findings demonstrate that NaOH-activated ramie leaves have considerable potential as an effective, low-cost, and environmentally friendly bioadsorbent for Pb²⁺ removal from wastewater.

Lead (Pb²⁺) contamination in wastewater is a major environmental concern due to its toxicity, persistence, and ability to accumulate in living organisms. Adsorption using biomass-based materials has been developed as an alternative treatment method because it is efficient, economical, and environmentally friendly. This study aimed to analyze the effect of bioadsorbent dosage and contact time on Pb²⁺ removal efficiency and evaluate Pb²⁺ mass distribution using mass balance analysis in a batch adsorption system. Ramie leaf (Boehmeria nivea) was utilized as a bioadsorbent due to its lignocellulosic content, which provides active sites for metal ion adsorption. The research was conducted experimentally through bioadsorbent preparation, chemical activation, and batch adsorption using artificial Pb²⁺ solutions with variations in bioadsorbent dosage and contact time. Pb²⁺ concentrations before and after adsorption were analyzed using Atomic Absorption Spectroscopy (AAS). The obtained data were used to determine removal efficiency and Pb²⁺ distribution between the liquid phase and bioadsorbent. The results showed that ramie leaf bioadsorbent effectively reduced Pb²⁺ concentration, with the optimum condition obtained at 4 g/L bioadsorbent dosage and 90 minutes contact time, achieving 98.46% removal efficiency. Mass balance analysis indicated that Pb²⁺ ions were successfully transferred from the solution phase onto the bioadsorbent surface. These findings demonstrate that ramie leaf bioadsorbent has potential as a sustainable alternative material for heavy metal removal in wastewater treatment.

The evaluation of haul road geometry at PT Trubaindo Coal Mining was conducted to ensure that the haul road from the stockroom to the jetty meets applicable technical standards, thereby supporting the smoothness, safety, and efficiency of coal transportation activities. This study aims to analyze the conformity of haul road geometric parameters, including straight road width, curve width, curve radius, cross slope, longitudinal grade, and superelevation, based on the standards of AASHTO 7th Edition and Kepmen 1827 of 2018. The research method employed field measurements using a Terrestrial Laser Scanner (TLS), followed by data processing using Maptek and Surpac software. The obtained data were then compared with the applicable standards to determine the level of conformity of the haul road geometry. Based on field measurements, the average values obtained were 14.99 m for straight road width, 18.45 m for curve width, 0.22 m for cross slope, 6.97% for grade, 223.51 m for curve radius, and 1.40 m for superelevation. Furthermore, based on calculations and analysis referring to AASHTO 7th Edition and Kepmen 1827 of 2018, and considering the largest haulage equipment used (Volvo FMX 480), the ideal haul road geometry values were determined as follows: 13 m for straight road width, 17 m for curve width, 124 m for curve radius, 0.26 m for cross slope, 1 m for superelevation, and 6% for grade based on PT Trubaindo Coal Mining standards.

Jamu is a traditional medicine still widely consumed by the public, but it has the potential to be contaminated with the heavy metals lead (Pb) and cadmium (Cd), which are toxic and can cause health problems, particularly to the liver and kidneys. Heavy metal contamination can originate from raw materials grown in polluted environments and from processing, storage, and packaging that do not meet quality standards, particularly for products that have not undergone official supervision. This study aims to analyze the content of lead and cadmium metals in registered and unregistered herbal medicine products. The analysis was carried out using the Atomic Absorption Spectrophotometry (AAS) method after sample preparation through wet digestion using strong acid. Six herbal medicine dosage forms were analyzed, namely powder, chopped, pills, capsules, cream, and shake parem. Method validation included tests for linearity, precision, limit of detection, and limit of quantification to ensure the reliability of the analysis results. The results showed that all registered herbal medicine samples met the safety requirements for Pb and Cd. In contrast, several unregistered herbal medicine preparations, especially powder, chopped, and cream, did not meet the safety requirements for Cd, while the Pb levels in all samples met the safety requirements for Pb. These findings indicate that unregistered herbal medicines carry a higher risk of heavy metal contamination. Therefore, strengthening quality control, selecting safe raw materials, and increasing compliance with regulations are necessary to ensure the safety of herbal medicine consumption and protect public health.

Bintan Island has abundant bauxite soil resources; however, its utilization as road construction material remains limited. The scarcity of high-quality granular material in the region necessitates the use of available local resources, particularly for pavement subgrade layers. This article aims to analyze the classification and mechanical properties of native soils in Bintan Island through a systematic literature review. The reviewed literature includes laboratory test results of bauxite soil. The findings indicate that bauxite soil exhibits low plasticity, relatively high CBR values (±35%), and is classified as CL (USCS) and A-2-4 (AASHTO). These results suggest that bauxite soil is suitable for subgrade applications, although require stabilization with binding agents. The implication of this review highlights that the utilization of local materials could support sustainable infrastructure development in island regions by reducing dependency on imported materials.  

In the digital age, English Education students still face difficulties in developing Academic English Proficiency because classroom learning is still dominated by traditional methods that are less appealing to digital natives. This study aims to explore and evaluate the integration of TikTok Learning Games (TLG) as a gamification-based learning medium to improve EAP for students in the English Education Study Program at Medan State University. Using a qualitative approach with a limited Research and Development model, data was collected through open-ended questionnaires and digital observations on TikTok, then analyzed using thematic analysis. The results showed that after two weeks of implementing TLG, students experienced improvements in academic vocabulary, pronunciation, contextual understanding, learning motivation, and speaking confidence, with 80% of participants stating that learning felt more enjoyable and less boring. However, a small number of students did not show significant changes due to limited access to technology and inconsistent use. Overall, this study concludes that TLG is an effective and practical digital gamification strategy for improving English proficiency, and can be used as a reference for lecturers in developing social media-based learning innovations in higher education.

Kidney trauma is a relatively common urological injury, often resulting from high-speed motor vehicle accidents, falls, or violent incidents. The kidneys are vulnerable to both blunt and penetrating trauma, with blunt mechanisms accounting for approximately 90% of all renal injuries. This paper reviews the anatomy of the kidney, mechanisms of injury, classification according to the American Association for the Surgery of Trauma (AAST), diagnostic evaluation, imaging modalities, and current management strategies. Most renal traumas are managed conservatively based on hemodynamic stability, while surgical exploration is indicated in severe or vascular injuries. Understanding the mechanism of injury and applying appropriate diagnostic evaluations are essential to determine the correct management approach and improve patient outcomes. Moreover, advancements in imaging techniques, such as CT scans, have significantly improved the accuracy of diagnosing renal injuries. Early intervention and appropriate monitoring are crucial in preventing complications such as hemorrhage or renal failure. This review aims to provide a comprehensive overview of renal trauma management to aid clinicians in improving patient care and optimizing recovery.

Iron deficiency is one of the main causes of anemia, especially in women of childbearing age who have higher iron requirements. Preventive efforts can be done through functional food innovations based on natural iron sources. Beetroot (Beta vulgaris L.) and red spinach (Amaranthus sp.) are known to contain iron in high amounts so they have the potential to be used as alternative raw materials in the manufacture of gluten-free noodles. This study aims to determine the effect of beetroot flour and red spinach flour formulations on the organoleptic properties (color, aroma, taste, and texture) and iron content of gluten-free noodle products. The study used an experimental method with a Completely Randomized Design (CRD) consisting of four treatments: F0 (control), F1 (50:50), F2 (75:25), and F3 (25:75). Iron content analysis was carried out using the Atomic Absorption Spectrophotometry (AAS) method, while the organoleptic test involved 25 untrained panelists who were women aged 15–24 years. The results showed that treatment F3 produced the highest iron content of 12.092 ± 1.658 mg/100 g, while F2 achieved the highest sensory acceptability. Nevertheless, formulation F3 was determined to be the best formulation due to its optimal iron content. This gluten-free noodle product based on beetroot and red spinach has the potential to be developed as a functional food to prevent iron deficiency anemia in women of childbearing age.

Mercury is a highly toxic and bioaccumulative heavy metal. Despite its prohibition, mercury is still frequently found as a contaminant in cosmetic products, particularly in whitening products. This article aims to review and present various findings from previous studies on mercury levels in cosmetic preparations marketed in Indonesia, analyzed using the Atomic Absorption Spectrophotometry (AAS). The method employed is a literature review of scientific articles published between 2015 and 2025, selected based on their focus on mercury analysis in cosmetics use of the AAS method. The review results show that the majority of whitening creams and lotions contain mercury levels exceeding the safety limits set by the Indonesian National Agency of Drug and Food Control (BPOM RI), with some samples showing extremely high concentrations reaching thousands of ppm. In contrast, other preparations such as powders, hair dyes, and deodorants generally have low or undetectable mercury levels. These findings indicate a lack of understanding regarding mercury and its dangers, especially regarding compliance with regulations on cosmetic products, especially those sold online. The conclusion of this review emphasizes the need for enhanced regulatory enforcement, stricter supervision, and increased public education to protect consumers from the health risks posed by mercury-containing cosmetics.

Current water safety issues in society are very diverse. Water quality safety issues are closely related to the bioethics of water testing, because water testing involves protecting human health and the environment. Water quality testing is an important part of ensuring that the water consumed is safe for human health. The purpose of this study was to evaluate the application of bioethical principles in water quality testing (Pb and Cd). This study was conducted in March 2025 at the UPT Food Security Laboratory of Medan City. The data analysis used in this study used qualitative descriptive methods to see the pattern of observation responses. The results of the study showed that in the bioethical aspect of sample testing, analysts who conducted the testing had implemented bioethics or SOPs that apply in food quality and safety testing laboratories. In conducting water testing for lead and cadmium examination, the procedures used were in accordance with applicable requirements using testing procedures from SNI (Indonesian National Standard).

Penenelitian ini bertujuan untuk meningkatkan keamanan data pada Sistem Informasi Manajemen Masjid (SIM Masjid) dengan menggunakan algoritma Caesar Cipher. Algoritma ini mengenskripsi data login, seperti username dan password, dengan metode pergeseran karakter. Hasil pengujian menunjukan bahwa algoritma ini mampu menjaga kerahasiaan data tingkat dasar, meskipun rentan terhadap serangan brute force. Oleh karena itu, metode ini cocok untuk sistem dengan kebutuhan keamana rendah dan dapat dikombinasikan dengan algoritma lain untuk meningkatkan perlindungan. Pendekatan ini memberi solusi sederhana dan efisien untuk sistem informasi di lingkungan dengan keterbatasan sumber daya.

Mining roads are one of the most important facilities that greatly affect the smoothness of production and affect mining costs. Therefore, the construction of mining roads must be carried out carefully to meet technical and work safety standards. Road conditions, distance, road slope and road carrying capacity will greatly affect the production capacity of heavy equipment, especially the production capacity of transport equipment. The location of this research is at PT. Energi Cahaya Industritama, precisely in Palaran sub-district, Samarinda city, East Kalimantan province. After observations were made at the research location, it was found that the geometric conditions of the road did not comply with the standards based on the overburden transport equipment or the largest transport equipment, for example, the width of the road on bends and the slope of the road. After conducting the research, the results of the data from the geometry of the access road were obtained, namely, the actual condition of the geometry of the access road on the straight road width is divided into 6 segments with a width of 13.3 meters, 14.3 meters, 14.5 meters, 13.2 meters, 15 meters, 15.7 meters. Meanwhile, the width of the bend road is also divided into 2 segments with a width of 15.9 meters and 15.5 meters respectively. And on the slope of the road there are 2 segments with values ​​of 11.1% and 14.8% respectively. Based on the results of the simulation software, the productivity of the transport equipment was obtained at 92.42 BCM/hour, which shows that productivity has increased by 12.23 BCM/hour from the actual productivity value of 80.109 BCM/hour. It has an average cycle time of 10.33 minutes, which shows a reduction in time or 6.01 minutes faster than the actual average cycle time of 16.34 minutes.

Fish is one type of aquatic product widely used by the community because of its advantages as a food ingredient, including a source of important nutrients such as protein, vitamins, fat, and minerals. Fish is often found in cans. Canned packaging contains the heavy metals lead (Pb), cadmium (Cd), and zinc (Zn), which can be released into food due to the long storage period. This study aims to identify and analyze heavy metals Pb, Cd, and Zn levels in canned tuna with an expiration date of less than 1 year. Samples of canned tuna came from five different brands. Qualitative analysis used color reagents, while quantitative research used an atomic absorption spectrophotometer (AAS). The qualitative study results showed that three samples of tuna contained heavy metals. Samples B and C were positive for Pb metal, while samples A and B were positive for Zn metal. The concentration of Pb metal was measured in sample B at 117.9 mg/Kg and in sample C at -0.0147 mg/Kg. The concentration of Zn metal in sample A was -0.0048 mg/Kg, and in sample B, it was -0.147 mg/Kg.  

A study on the description of silver (Ag) levels in liquid waste fixer originating from a radiology installation before being processed at the Waste Treatment Installation is sometimes necessary to avoid environmental pollution. The time and place of this research were conducted at the radiology installation for approximately 1 (one) month. The purpose of this writing is to determine the description of the silver (Ag) levels of fixer in the radiology installation. This research method is field observation. and the processing of silver levels was carried out at the Medan standardization research agency (baristand) with researchers sending samples of 100 mg/l to be tested for silver levels. The thing studied in this study was to determine the description of silver levels using the Atomic Absorption Spectrophotometry (AAS) method. From the observation results after processing, the Ag content was 0.03 mg/L. After processing, the silver content was allowed to be discharged directly into the environment or public channels because the results were still below the established quality standards, namely 5.0 mg/L. However, it would be better if each hospital was advised to process the liquid waste at the Wastewater Treatment Plant to avoid environmental pollution.

Film is a form of communication media used as a tool to convey messages, especially in the context of public entertainment. With the rapid development of film, web series have become increasingly popular and a topic of discussion among the public. One currently popular series is "Bidadari Bermata Bening," directed by Farid Dermawan, featuring drama, romance, and religious genres. The author's purpose in researching this movies is to explore the denotative and connotative meanings, myths, and moral messages conveyed through the series. This research utilizes qualitative research methods grounded in Roland Barthes' semiotic theory. The data collection techniques used include observation, literature study, documentation, and interviews. The results obtained from this study indicate that the series contains moral messages interpreted through denotation, connotation, and myth. namely: (1) Maintaining trust and placing faith in Allah. (2) Taking responsibility for decisions made. (3) Consequences of wrongdoing. (4) Perseverance in facing challenges. (5) Importance of respecting others' decisions. (6) The significance of persistence and courage in dealing with failure. (7) Dishonesty is not the right path.

Kuliah Kerja Nyata (KKN) program in Wonorejo Village, Karanganyar District, Kebumen Regency, aims to bridge academic theory with community practice through the preservation of pandan leaf weaving crafts and the strengthening of local SMEs. This program involves students from Universitas Muhammadiyah Purwokerto for 32 days, focusing on increasing youth interest in traditional crafts and innovating product packaging. Methods employed include observation, field research, and training. Results indicate a decline in young artisans and a need for innovative packaging designs to improve product marketing. Social learning and innovation theories are used to encourage youth participation and enhance product appeal. The program faces challenges in attracting youth interest and the need for appropriate training. In conclusion, KKN successfully applies social and economic theories to address local issues, resulting in social changes that include economic development, skill enhancement, and the creation of a sustainable community.

This research aims to determine the effect of Economic Value Added (EVA) and Market Value Added (MVA) on stock prices. The population of this research is the financial report of PT Telkom Indonesia Tbk which was taken from the official website. Based on sampling in this research, the samples used were Economic Value Added (EVA) and Market Value Added (MVA), and stock prices with a period of 12 years, namely in 2012-2023. Secondary data is in the form of the company's annual report/sustainability report. This type of research is a quantitative type that is associative in nature. The data analysis technique used is multiple linear regression analysis, classical assumption test, t test, F test, and coefficient of determination test, processed using SPSS 25. Based on the results of data analysis it can be stated that Economic Value Added (EVA) and Market Value are simultaneously Added (MVA) has an effect on share prices. Partially, it shows that Economic Value Added (EVA) has a t value of 2.238 < t table 2.228 and a significant value of 0.052 > 0.05, which means it has no influence on the share price at PT Telkom Indonesia Tbk and Market Value Added (MVA) has a t value of 8.134 > ttable 2.2248 and a significant value of 0.000 <0.05, which means it has a positive and significant influence on the share price of PT Telkom Indonesia Tbk in 2012-2023.

This research is research that aims to determine the ability to write drama scripts for class VIII K students at SMP Negeri 12 Tasikmalaya. This research uses a qualitative descriptive method with the source of the data obtained through observation and direct observation in the field. The data collection techniques used are observation and data assessment. The research results show that class VIII K students at SMP Negri 12 Tasikmalaya are in the good category with an average score of 84%.

Salt is a source of electrolytes and iodine which are very important for the human body. East Kalimantan Province has the potential for diverse coastal and marine resources with high economic value, so it has great potential for optimal, effective, efficient and sustainable management. This research aims to determine the compound content of krosok salt that will be distributed to the public with NSI. This research method is based on NSI 3556:2016 and Atomic Absorption Spectrophotometry (AAS) method, including: (1) Water content analysis; (2) Analysis of the part that is not soluble in water; (3) NaCl content; (4) KIO3 levels; (5) Analysis of metal contamination. This research was conducted on krosok salt in Kersik Village, Kutai Kartanegara Regency. The NaCl salt content does not meet the minimum NSI requirements, namely 94%. Meanwhile, Pb, Cd, metal contamination meets the requirements with values ​​below 10 mg/kg and 0.5 mg/kg.

Along with increasingly rapid technological developments in our country, the number of existing industries is increasing. Apart from producing useful products, this industry also produces waste. The waste produced contains a lot of heavy metals, one of which is the heavy metal lead. If the lead metal in the waste receives little treatment, this can cause pollution in the environment, even though this waste is present in small quantities, the lead condition is unstable and if it accumulates in the body, it can ultimately trigger cancer cells (carcinogenic) which can be dangerous for health. . In this research, adsorption of PB2+ ions was carried out on canned ground meat, where heavy metal contamination occurred in the ground meat. This research aims to determine the effectiveness of the absorption of heavy metals (Pb) contained in ground beef and their characteristics. The uptake of PB2+ ions in ground beef, measuring the concentration of PB2+ ions before and after receiving treatment, was carried out using an instrument, namely AAS, at a wavelength of 217nm. The research results showed that the effectiveness of ground beef in absorbing PB2+ ions in canned food was as high as brand a: 0.023; brand b: 0.009; brand c: 0.006