STATUS PENCEMARAN, STATUS TROFIK DAN LOGAM BERAT DI PERAIRAN DANAU MANINJAU KABUPATEN AGAM

Abstract

Abstrak

Tujuan penelitian ini adalah (1) Menganalisis status pencemaran air, (2) Menganalisis status trofik air, (3) dan menguji konsentrasi logam berat pada air Danau Maninjau meliputi Cuprum (C_u,) Ferrum (F_e), Plumbum (P_b) dan Zinc (Z_n). Penelitian dilakukan dengan menggunakan metode survey dan penentuan lokasi secara “purpossive sampling”. Menentukan status pencemaran air Danau Maninjau menggunakan analisa STORET. Menguji tingkat trofik air menggunakan metode Carlson’s 1977. Selanjutnya mengambil sampel air untuk menganalisis parameter fisika-kimia. Berdasarkan analisis Storet, mutu air pada setiap stasiun penelitian memilki skor yang sama pada skor -48 yang artinya semua stasiun tercemar berat (kelas D). Berdasarkan nilai TSI Danau Maninjau termasuk kategori hypereutrofik (kesuburan tinggi). Hasil penelitian meliputi logam Cu berkisar antara  0,59-1,87 mg/L, kadar Fe berkisar antara 0,07-0,62 mg/L, logam Pb dengan kisaran nilai 0,10-1,20 mg/L, dan logam Zn berkisar antara 0,41-0,94 mg/L yang menunjukkan bahwa kawasan Danau Maninjau telah mengalami penurunan kualitas air dengan adanya kandungan logam berat yang melebihi baku mutu kualitas air.

Kata Kunci : Status Pencemaran, Status Trofik, Logam Berat, Danau Maninjau

Abstract

The objectives of this study is (1) Analyzing the status of water pollution, (2) Analyzing the trophic status of water, (3) and testing the concentration of heavy metals in Lake Maninjau water including Cuprum (Cu,) Ferrum (Fe), Plumbum (Pb) and Zinc (Pb) and Zinc (Pb) Zn). The study was conducted using survey methods and location determination by "purposive sampling". Determine the status of Lake Maninjau water pollution using the STORET analysis. Test the trophic level of water using Carlson’s 1977 method. Next, take water samples to analyze physic-chemical parameters. Based on the Storet analysis, water quality at each research station has the same score at a score of -48 which means that all stations are heavily polluted (class D). Based on the Lake Maninjau TSI score, it is categorized as hypereutrophic (high fertility). The results of this research include Cu metal ranging from 0.59-1.87 mg / L, Fe content ranging from 0.07 to 0.62 mg / L, Pb metal with a range of values from 0.10 to 1.20 mg / L, and Zn metal ranges from 0.41 to 0.94 mg / L which indicates that the Lake Maninjau region has experienced a decrease in water quality in the presence of heavy metal content that exceeds water quality standards.

Keywords: Pollution status, trophic status, heavy metal, Lake Maninjau