Chromatography of bis-(3-sulfopropyl) disulfide and its breakdown products by HPLC coupled with electrochemical detection

✍ Scribed by Igor Volov; Olivier Mann; Yvonne Hoenersch; Björn Wahl; Alan C. West

• Book ID: 102446604
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 260 KB
• Volume: 34
• Category: Article
• ISSN: 1615-9306
• DOI: 10.1002/jssc.201100352

✦ Synopsis

Abstract

A chromatographic method for the detection of bis‐(3‐sulfopropyl) disulfide (SPS), a common additive in acidic copper plating baths, and its breakdown products is demonstrated. The detection scheme involves a combination of solid‐phase extraction for sample pre‐treatment, C~18~ reversed‐phase high‐performance liquid chromatography column for separation, and electrochemical sensor for detection of all non‐fully oxidized sulfur‐containing compounds. We were able to achieve an effective separation and accurately assign chromatographic peaks to all detectable species. Owing to a high sensitivity of the utilized electrochemical detector, detection in low parts per billion range was possible. This can prove crucial for plating bath control, since minute amounts of certain by‐products significantly affect the bath performance.