Heavy metals in aquatic environments have been known to cause some damage to aquatic life. Pb metal is found in waste that pollute the waters. In modern life today many people have a habit of disposing of garbage disembarang place. Utilization of jengkol skin powder which is organic waste scattered in the traditional market can be used for the processing of liquid waste containing Pb metal.This research used experimental method by using Atomic Absorption Spectrophotometer which then analyzed statistically using two way ANOVA test without interaction.From the results of the study found that jengkol skin powder can absorb Pb metal that exists in the liquid waste in the surrounding environment. After statistical test with two-way ANOVA test without interaction, Pb metal absorption by jengkol skin powder with pH and mass ratio, then got value of F count (mass) = 3,763 and F value table = 98,50 while F value count (pH) = 0,812 with value F table = 99,00 with result Ha rejected and H0 accepted. From the results of this study can be concluded that there is no significant difference in the absorption of Pb logan using jengkol skin powder in pH and mass variations.

Gold processing by amalgamation produces gold amalgam and waste mercury. Poor mercury waste management can pollute the environment. Ilegal gold miners are often found in West Sumatra. In the process of gold processing always use Hg for the purification of the gold. This study aims to determine the level of mercury (Hg) in the gold miner's urine and see the long-working relationship. Mercury (Hg) is a heavy metal grouped into groups having high toxicity levels. The use of mercury (Hg) in the gold processing process can cause negative impact. Determination of mercury (Hg) with Atomic Absorption Spectrophotometer (SSA) method. The population of this research is gold miner worker in Nagari Koto Tuo Sijunjung as many as 3 people and also as sample. The instrument used in this research is a questionnaire and testing of urine specimen dilaboratorium with wet destruction method in research in.i Factors studied are the characteristics of r0espondents including age, and length of work. Sampling was done as much as 20 ml of urine. Urine sample examination was done at Laboratory by using Wet Destruction method. The result of mercury (Hg) examination in gold miner's urine was obtained by an average of 15.8 μg / l Mercury (Hg) in urine with a threshold of 4 μg / l. The benefit of this research is to provide an overview of the level of toxicity that occurs due to gold mining in illegal gold miners in Nagari Koto Tuo Sijunjung, West Sumatra.

Melinjo has the potential as a natural antimicrobial in the sense that melinjo can be used as a natural food preservative as well as a medicine for diseases caused by bacteria. Some antibacterial compounds of melinjo fruit peel include xanon, saponin, steroids and flavoniod. The test bacteria used are Escherichia coli because these bacteria include bacteria that cause infection in humans. This study aims to look at the antimicrobial ability of melinjo fruit peel extract against Escherichia coli bacteria and to find out what the right concentration is as an antimicrobial of melinjo fruit peel extract with concentrations of 50%, 75%, 100% and 200%. The benefit of this study was to determine the antimicrobial activity test on melinjo fruit peel on Escherichia coli bacteria, to determine the concentration of melinjo fruit peel extract which is well used as an antimicrobial, to increase the effectiveness of melinjo fruit peel as an antimicrobial against Escherichia coli bacteria. The results obtained showed that the highest concentration of antimicrobial activity against Escherichia coli gram negative pathogens was 50% concentration. Because with the addition of a higher concentration of concentrations of 75%, 100% and 200% do not get antimicrobial activity in accordance with the addition of the given concentration. Addition of concentration does not result in significant increase in antimicrobial activity.

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