Effect of pH Change on the Form and Mobility of Pb and Ni in Municipal Sludge

By adopting BCR sequential extraction procedure,the effect of pH change on the form of Pb and Ni in municipal sludge was studied.As indicated by the result,pH had great impact on the form of Pb and Ni.Pb existed in sludge mainly in the oxidant and residual form,but the total content of these two forms decreased as the pH increased.The Ni in the sludge was mainly in the oxidant form.pH value had obvious inhibition effect on the bioavailability of Ni.