Systems of waste management in Padangsidimpuan City is an open dumping system. The location of the Padangsidimpuan City landfill is carried out at the Batu Bola TPA located in Batu Bola Village which is 120 meters from the Batang Ayumi river flow. Continuous landfill in the landfill produces pollutants in the form of leachate. Leachate contains organic materials and heavy metals. Heavy metals that are often found in leachate water are Iron (Fe) cadmium (Cd) and Zinc (Zn). This research aims to know the quality of the water of the Batang Ayumi river in terms of the content of heavy metals Cd, Zn, and Fe. This research uses descriptive exploratory method by conducting a survey first. The determination of the sampling location using purposive sampling method at four stations specified. River water sampling is carried out twice, before and after rain. This research uses an Atomic Absorption Spectrophotometer tool. The data obtained were analyzed by comparing research data with water quality standards based on PP. No. 82 of 2001 to look at the conditions of the heavy metal pollution of Cd, Zn and Fe. The results of this study showed that the average concentration of the metal content Cd, Zn and Fe werw below the specified quality threshold, namely the concentration of metal Cd of all stations is 0.0009 mg/l, a concentration of metal Fe is 0.03 mg/l, and concentration of Zn metal is 0.0002 mg/l.
The purpose of this study is to find out the river water quality in terms of the spread of heavy metals found from the gold mining in Batang Gadis Mandailing Natal River and to determine the effect of heavy metal distribution on river flow from the gold mining of aquatic biota on the Batang Gadis Mandailing Natal River. This research uses descriptive exploratory method by conducting a survey first. Determination of sampling sites using purposive sampling method at the two stations that are determined. Sampling of water and sediments from each location. Water samples were taken as much as 500 mL, samples of sediment were taken at a depth of 10-15 cm from the base surface as much as 100-200 g (Mann, 1978). Examples of water biota are randomly taken at each station as much as 50-100 g, then put together into a composite sample for further analysis in the laboratory. Water quality is measured insitu include temperature, brightness, turbidity, depth, current speed, pH, DO, CO2. While the COD sample, BOD was taken to the laboratory to be analyzed by preservation using ice at a temperature of around 4 oC before observing in the UMTS biology laboratory. Data obtained, then analyzed descriptively. The results of this study are the levels of heavy metals found in the two Batang Gadis River observation stations that are equally good in water, sediment and those found in fish, namely Hg <0,0008, Cd <0,003 and Pb <0,005. Metal levels found are still below the threshold value, but need to be aware of the accumulation of these metals. The histological observations of crisp fish gills at the Bustak mine station are found to experience edema and necrosis which are strongly suspected to be caused by pollution of heavy metals found in the Batang Gadis River. The histological observations of crisp fish liver at the Bustak mine station are found to experience necrosis which is allegedly caused by heavy metal pollution found on the Batang Gadis River
Safe and proper disposal of waste is an important component in integrated waste management. The method of accumulating garbage in landfills (TPA) can result in a decrease in environmental quality due to air pollution due to solid waste burning, groundwater pollution due to leaching, and an increasing number of disease vectors that can endanger the health of waste collectors and residents. around the landfill. The purpose of this study was to determine the metal content of Lead (Pb), Mercury (Hg) and Copper (Cu) in the leachate of TPA BatuBola. This research method uses descriptive exploratory method by conducting a survey first. Atomic Absorption Spectrophotometer is a tool used in this study. Data analysis was carried out by comparing the test result data with the quality standards by Permen LHK P.59 / 2016 and Permen LHK No.5 / 2014. The data shows that the concentration of Hg metal is <0.0004 mg / L. Meanwhile, the threshold set by the government is 0.005 mg / L. The concentration of lead metal (Pb) also shows a value that is below the quality standard threshold, namely <0.003 mg / L, while the set limit is 0.1 mg / L. As well, the measurement of copper metal (Cu) is still below the quality standard threshold, namely <0.006 mg / L, while the limit set by the government is 2.0 mg / L. However, caution must be exercised because if it is accumulated in large quantities it can still be dangerous.
The role of food additives (BTP), especially preservatives, is becoming increasingly important in line with technological advances in the production of synthetic food additives. Preservatives are used to preserve food that is easily damaged. Lately with many found food products such as tofu, meatballs, noodles and snacks of school children containing harmful chemicals that cause people to be careful in consuming these types of foods. The food is often sold in the school environment by food vendors and sold freely in the community. The majority of school food snacks (PJAS) throughout 2010 still contain hazardous chemicals. As a result of almost every year still found some schoolchildren, especially at the elementary level, experiencing food poisoning. The number of PJAS containing hazardous materials is reflected from the supervision of the Food and Drug Supervisory Agency (BPOM). In this case, devotees have provided direction and counselling about healthy snacks and simple test of snack test containing formalin and borax conducted in workshop activity. The target of this activity is the teachers and elementary school children at SDN 200201 Padangsidimpuan. The number of extension participants is 90 people consisting of teachers and students. The place of execution of activities carried out in SDN 200101 Padangsidimpuan. The implementation method used an experimental method and mentoring. With this activity is expected to provide information and hazard knowledge of chemical content in foods, especially formalin and borax to create a healthy and quality generation. Keywords: Healthy snacks, formalin, borax AbstrakPeran bahan tambahan pangan (BTP) khususnya bahan pengawet menjadi semakin penting sejalan dengan kemajuan teknologi produksi bahan tambahan pangan sintetis. Bahan pengawet umumnya digunakan untuk mengawetkan pangan yang sifatnya mudah rusak. Akhir-akhir ini dengan banyak ditemukan produk-produk pangan seperti tahu, bakso, mie serta jajanan anak sekolah yang mengandung bahan-bahan kimia berbahaya sehingga menyebabkan masyarakat perlu hati-hati dalam mengkonsumsi jenis-jenis makanan tersebut. Makanan tersebut sering dijual dilingkungan sekolah oleh penjaja makanan, serta terjual bebas di masyarakat. Mayoritas pangan jajanan anak sekolah (PJAS) di sepanjang tahun 2010 masih mengandung bahan kimia berbahaya. Alhasil hampir setiap tahun masih ditemukan sejumlah anak sekolah, khususnya di level SD, mengalami keracunan makanan. Banyaknya PJAS mengandung bahan berbahaya tercermin dari hasil pengawasan Badan Pengawasan Obat dan Makanan (BPOM). Dalam hal ini pengabdi telah memberikan arahan dan penyuluhan tentang jajanan sehat dan tes sederhana uji jajanan yang mengandung formalin dan boraks yang dilaksanakan dalam kegiatan workshop. Target kegiatan ini adalah guru-guru dan anak-anak SD di SDN 200201 Padangsidimpuan. Jumlah peserta penyuluhan sebanyak 90 orang terdiri dari guru dan siswa/i. Tempat pelaksanaan kegiatan dilaksanakan di SDN
The problem of this research is the low of the student’ ability critical thinkig and the result of student study of SMA Negeri 1 Padang Bolak in class ten. The goal of this research is to make the critical thinking of the student of the student better and to make better the result of their study is chemistry by using cooperatif studying think pair share. The tool to collect the data is test of ability in critical thinking questioner of critical thinking, paper of student activity and also teacher work. The observation kind of research is class action research (PTK). The result of the student study by using studying method of student cooperatif think pair share in the class of ten and according to the result of the student ability in critical thinking in the first siclus is 16 the student pass the tes and the second siclus about 25 the student pass the test from 30 student follow student tes. The result questioner of critical thinking first siclus is enough and second siclus is very good. The result activity observation student has increased as well as the teacher performance observation that has increased. From the research we kow that there is the growth i the questioner of student thinking thinking ability, student activities and the teachers ability in using think pair pair share cooperative studying model in class ten of Mia-4 SMA Negeri 1 Padang Bolak. So, this model can be used i chemistry study and others.
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