Journal of Research and Development
Open Access

Abstract

Efficient generation of volatile cadmium species using Ti(III) and Ti(IV) and application to determination of cadmium by cold vapor generation inductively coupled plasma by mass spectrometry (CVG-ICP-MS).

Zikri Arslan

A chemical vapor generation (CVG) method is developed for determination of cadmium (Cd) by ICP-MS. Titanium (III) and titanium (IV) were utilized for the first time as novel additives to enhance generation of volatile Cd species, and their synergistic effects were investigated for thiourea, L-cysteine and potassium cyanide (KCN) with different mineral acids. Both Ti (III) and Ti (IV) provided the highest enhancement with KCN. The improvement with thiourea was marginal (ca. 2-fold), while L-cysteine boosted signals slightly only with Ti (III) in H2 SO4 . Optimum CVG conditions were 4% HCl + 0.03 M Ti(III) + 0.16 M KCN and 2% HNO3 + 0.03 M Ti(IV) + 0.16 M KCN. A 3% (m/v) NaBH4 solution was adequate for successful vapor generation. Under these conditions, sensitivity was enhanced 40-fold with Ti(III) and 35-fold with Ti(IV), that are the highest enhancement factors achieved so far in Cd vapor generation.

Published Date: 2020-10-30;