Implementation of the AAS and Wenner Geoelectric Test to determine the Plumbum (Pb) distribution in River Border of Kanal Banjir Barat Semarang, Indonesia

The establishment of industry in the area around the Kaligarang River causes environmental pollution, one of which is a heavy metal that is suspected to occur seepage on river banks. To find out the presence of heavy metals below the surface, a Wenner Configuration Geoelectric Method and AAS (Atomic Absorption Spectrophotometry) were used to determine the Pb heavy metal seepage using wells and residents' river water samples. Geoelectric data collection and AAS Tests were carried out in Tanah Mas (A) and Semarang Indah (B) areas. In each field A (Tanah Mas) and B (Semarang Indah) geoelectric measurements were made using the Wenner method with 3 parallel lines. The result, in field A the first lane to the third lane is predicted as clay with resistivity values ​​between 0.00844 Ωm to 15.75 Ωm at a depth of 0.5 meters to 6.91 meters. Pollutants can be predicted with a low resistivity value, for track A pollutants are identified with resistivity values ​​between 0.00844 44m to 2.21 21m. At location B, the first to third lanes are predicted as clay with resistivity values ​​between 0.037 Ωm to 9.68 Ωm at a depth of 0.5 meters to 6.91 meters. Pollutants at location B were identified with resistivity values ​​between 0.037 Ωm to 2.81 Ωm. Based on the AAS test that has been carried out at 8 points of water and river sampling locations, only two locations were obtained that showed the presence of Pb heavy metals, namely residents' well water at location A, point three and river water samples at location B with a concentration value of 0.030 mg / L and 0.072 mg / L, so it can be concluded that there is no Pb heavy metal seepage in the residential area.