Identifikasi Hubungan Kandungan Logam Berat dengan Nilai Suseptibilitas Magnetik pada Tanah Lapisan Atas di Kota Sawahlunto

Authors

  • Elga Sri Wahyuni Laboratorium Fisika Bumi, Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Andalas
  • Afdal Afdal Laboratorium Fisika Bumi, Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.7.1.1-7.2018

Abstract

Telah dilakukan identifikasi kandungan logam berat menggunakan metode magnetik pada tanah lapisan atas pada empat lokasi di kota Sawahlunto yaitu pada daerah pertambangan, sekitar PLTU, daerah pertanian dan pusat kota Sawahlunto. Sampel tanah diambil sedalam 20 cm dari permukaan tanah, masing-masing 10 titik pada setiap lokasi. Pengukuran suseptibilitas magnetik menggunakan alat Bartington MS2 dengan sensor MS2B pada 15 arah berbeda. Hasil pengukuran menunjukkan bahwa sampel memiliki nilai suseptibilitas magnetik antara 12,9⨯10-8 – 98,4⨯10-8 m3/kg. Suseptibilitas magnetik dengan nilai lebih kecil daripada 150⨯10-8 m3/kg termasuk kategori pencemaran tingkat rendah, namun di beberapa titik telah termasuk kedalam kategori pencemaran sedang. Untuk setiap lokasi diambil 5 sampel untuk ditentukan kandungan logamnya dengan X-Ray Flouroscence. Daerah yang tercemar logam berat paling banyak adalah daerah pusat kota Sawahlunto dengan kandungan rata-rata logam berat Cu (312 ppm), Zn (1612 ppm),  Pb (226 ppm), As (108 ppm), Cr (136 ppm), Fe (123396 ppm). Daerah yang sedikit terkontaminasi logam berat yang telah melewati batas ambang dalam tanah yaitu daerah pertanian dengan logam As (32 ppm), Cr (22 ppm) dan Fe (71788 ppm). Logam berat yang telah melewati batas ambang untuk setiap lokasi pengambilan sampel adalah logam As, Cr dan Fe. Nilai suseptibilitas magnetik memiliki hubungan dengan konsentrasi logam berat walaupun dengan nilai koefisien korelasi yang kecil (R<0,5).

Kata kunci: suseptibilitas magnetik, logam berat, tanah lapisan atas

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Published

2018-01-03

Issue

Vol. 7 No. 1 (2018)

Section

Articles

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Copyright (c) 2018 Elga Sri Wahyuni, Afdal Afdal

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