Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1209354 | Journal of Chromatography A | 2010 | 7 Pages |
Abstract
Monitoring of trace impurities in electroplating bath is needed to meet EU requirements for WEEE and RoHS and for quality control of electrodeposits. Methods using IC and 100% aqueous CE buffer were found producing non-repeatable results attributed to interference of surfactants and major methanesulphonate anion. A new CE buffer containing 1.5Â mM tetraethylenepentaamine, 3Â mM 1,3,5-benzenetricarboxylic acid and 15Â mM Tris in 20% (v/v) methanol at pHÂ =Â 8.4 was shown to enhance the separation window, reduce interaction between buffer and bath constituents, and give satisfactory repeatability with baseline separation for 14 organic and inorganic anions within 14Â min, good repeatability for migration time (0.32-0.57% RSD), satisfactory peak area and peak height (2.9-4.5 and 3-4.7% respectively), low detection limit (S/NÂ =Â 2, 20-150Â ppb), and wide working ranges (0.1-100Â ppm). The CE buffer with 20% (v/v) methanol has demonstrated its capability for identifying anion impurities causing problem in aged tin bath and the use of only 10-fold dilution to produce reliable results for quality assessment in plating bath containing high surfactant additives.
Related Topics
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Authors
H. Sun, K.M. Lau, Y.S. Fung,