Penetuan kandungan unsue logam berat dalam air dan sedimen sungai Semarang dengan metoda "Analisis Pengaktifan Neutron"

Abstract

Telah dilakukan penelitian until menentukan kaudungan unsur logam berat dalam air dan sedimen sungai Semarang dengan rnetoda Analisis Pengaktifan Neutron ( APN ). Hasil penelitian memperlihatkan bahwa secara kualitatif, ternyata air dan sedimen mengandung logam-10..am Sm-153, Ce-141, Cr-51 dan Co-60 dan basil perhitungan secara kuantitatif dalam air yang mempunyai kadar tinggi di daerah Bandarharjo yaitu Sm-153 (3,028 ±0,096).104 ppm, Ce-141 (8,536 ±1,321).10-3 ppm dan Co-60 (3,039 ±-0,428).10-3 ppm. Simongan merupakan daerah yang mempunyai kadar rendah yaitu Sm¬153 (1,451 ±0,076).10-4 ppm, Ce-141 (2,433 ±0,281).10-5 ppm clan Co-60 (3,073± 0,018 ).104 ppm.Hasil perhitungan secara latantitatif dalarn sedimen meniperlihatkan logam yang mempunyai kadar tinggi di Simongan yaitu Sm-153 (6,090± 0,234 )ppm, Ce-141 (115,998±3,234)ppm, Cr-51 (17,928±3,436)pprn dan Co-60 (28,059± 2,345 )ppm. Tnah Dias rnempunyai kadar rendah, yaitu Sm -153 (4,357+0,204)p/3m, Ce-141 (48,177±12,152)ppm, Cr-51(41,073±9.836)ppm dan Co-60 (9,359±_0,209)ppm. Study on the heavy metal in waters and surficial sediments of Semarang river have been done by using Neutron Activation Analysis method (AAN ). Result show that factually waters and sediments contains metals Sm-153, Ce-141,Cr-51 dan Co-60 and the counting yield quantitatively from several elements in the higher concentrate contains heavy metals in Bandarharjo content was Sm-153 Sm-153 (3,028 ±0,096).104 ppm, Ce-141 (8,536 ±1,321).10-3 ppm dart Co-60 (3,039 ±0,428).10-3 ppm. The lower concentrate in Simongan was Sm-153 (1,451 ±0,076).104 ppm, Ce-141 (2,433 ±0,281).10-3 ppm dan Co-60 (3,073± 0,018 ).10-4 ppm. The counting yield quantitatively from several elements the higher concentrate in sediments contains heavy metals in Simongan was Sm-I53(6,090± 0,234 )ppm, Ce-141 (115,998±3,234)ppm, Cr¬51 (17,928±3,436)ppm dan Co-60 (28,059± 2,345 )ppm. The lower concentrate in Tanah Mas was Sat -153 (4,357±0,204)ppm, Ce-141 (48,177±12,I52)ppm, C:r-51(41,073±9,836)ppm dan Co-60 (9,359±0,209)pprn. viii