Screened indicators for the direct chelometric titration of lead(II)
Abstract
Two screened indicators, Eriochrome Black T-Methyl Red (7.4 + 1)-NaCl (1 + 100, m/m) and Bromopyrogallol Red-Naphthol Green B-Thymol Blue (2.5 + 21 + 1)-NaCl (1 + 100, m/m), are proposed for the titration of lead against Na2EDTA. Clarity and accuracy of titration are improved.