ANALISIS SPASIAL PERSEBARAN LOGAM BERAT KROMIUM (Cr6+) di ALIRAN SUNGAI KOTA PEKALONGAN

Abstract

Pekalongan City is the City of Batik with industrial competitive advantages. There are ±5 million liters of liquid waste resulting from industrial activities containing chemicals such as chromium 6. The waste is disposed directly into the river because the available WWTP only holds 45%, physically the river body is blackish and murky in color. This study aimed to determine the spatial distribution of chromium 6 in the river flow of Pekalongan City. Research using descriptive observational and grab sampling. Sampling was from 18 points consisting 3 sampling locations. Tests were carried out by the Center for Labkes in Central Java Province using a Spectrophotometry tool. The results found, in the Banger River, highest chromium content was at point A1, which was 0.07 mg/L, while for points B1, B2, B3, B4, B5, C1 and C2 the results were the same 0.006 mg/L. The results of the Loji River test were the same at each point, points A2, B6, B7, B8 and C3 0.06 mg/L. The results on the Asem Binatur River were also same at each point, points A3, A4, B9, B10 0.06 mg/L. The results of distribution maps were made using the IDW technique and analyzed using the overlay technique. The conclusions from this study are that there are 2 categories of pollution in the Pekalongan City River, namely light pollution in the Banger River and heavy pollution in the Loji River and Asem Binatur River.