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PERILAKU Pb DALAM TANAH DIPENGARUHI OLEH BOT

 

PERILAKU Pb  DALAM TANAH  DIPENGARUHI OLEH  BOT

 

Toksisitas dan ancaman bahaya pada tanah yang terkontaminasi Pb , sangat tergantung pada waktu penyerapan dan perilaku desorpsi Pb dalam tanah. Penelitian ini mengkaji penyerapan dan perilaku desorpsi ( pH = 5.50 , I = 0,05 M ) Pb dalam tanah lempung-debu dari Matapeake ( Typic Hapludult ) . Efek  BOT terhadap penyerapan dan desorpsi Pb dalam tanah dipelajari dengan memperlakukan tanah menggunakan sodium hypochlorite untuk menghilangkan fraksi BOT, dan menggunakan tanah dengan enam kali lebih banyak BOT ( St Johns liat pasir [ Typic Haplaquods ] ) .

Penyerapan Pb terdiri dari reaksi awal yang cepat dimana semua Pb yang ditambahkan ke tanah dapat diserap . Setelah reaksi awal yang cepat ini, penyerapan terus berlangsung dnegan kecepatan yang menurun.  Jumlah total Pb yang diserap adalah 102 ; 44 ; 27 mmol /kg  untuk tanah St Johns dan tanah Matapeake yang tidak diperlakukan dan tanah Matapeake yang diperlakukan.

Percobaan desorpsi dilakukan pada tanah-tanah dengan elektrolit sebagai efluentnya dalam reaktor-ruang aliran-diaduk. Pada tanah St Johns ternyata hanya  32 % dari total Pb yang diserap dapat dilepaskan kembali; sedangkan pada tanah Matapeake yang tidak diperlakukan dan tanah Matapeake yang diperlakukan ternyata sebesar 47 dan 76 % dari Pb yang diserap Pb dilepaskan kembali.

Korelasi antara BOT  dengan persentase Pb yang terdesorbsi dari tanah menunjukkan bahwa BOT memainkan peran penting dalam reaksi desorpsi lambat Pb dari tanah .

Percobaan penuaan dimana Pb yang diserap diinkubasi selama 1 , 10 , dan 32 hari,  menunjukkan bahwa waktu inkubasi sorpsi tidak berpengaruh terhadap perilaku desorpsi Pb .
Analisis tanah yang diperlakukan dan tanah yang tidak diperlakukan, dengan menggunakan metode Spektroskopi X – ray penyerapan struktur halus ( XAFS ) mengungkapkan bahwa struktur atom Pb yang diserap jelas berbeda dalam dua sampel . Pada tanah yang diperlakukan untuk menghilangkan BOT, data diwakili dengan baik oleh model teoritis menggunakan atom backscattering O , Si , dan Pb .  Pada  tanah yang tidak diperlakuakn , data XAFS digambarkan oleh O dan C backscatterers .  Hasil XAFS ini mengkonfirmasi bahwa mekanisme penyerapan Pb melalui dua sistem yang berbeda .

 

Sumber: Daniel G. Strawn  and Donald L. Sparks. 2000. Effects of Soil Organic Matter on the Kinetics and Mechanisms of Pb(II) Sorption and Desorption in Soil. SSSAJ. Vol. 2000. 64 No. 1, p. 144-156

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