Determination of toluene diisocyanate in plastic playground by ion chromatography with ultraviolet detection after alkaline suppressor

ANYL 107

Mei-Lan Chen, rain-lake@163.com, Department of Biological and Environmental, Zhejiang Shuren University, Hangzhou, 310015, China, Dong Fei, Ddpartment of Material and Chemical Engineering, Guilin University of Technology, Guilin, 541004, and Yan Zhu, Department of Chemistry, Zhejiang University, Hangzhou, 310028, China.
Toluene diisocyanate (TDI) can be hydrolyzed to toluenediamine (TDA) which can be separated by cation-exchange ion chromatography (IC) easily. The optimum IC separation was performed on a Dionex IonPac CS12A analytical column (150 mm x4.0 mm) using 20 mmol/L sodium sulfate, 10 mmoL/L sulfuric acid and10% acetonitrile as eluent. Using an UV detector at 212 nm for detection, it was found that a higher signal response of TDA could be obtained under an alkaline condition. With an added suppressor before detector and a regeneration eluent (0.8 mol potassium hydroxide-KOH), the pH of eluent was changed to about 10. As a result, the signal response was magnified by about 10 times and a lower limit of quantification (LOQs) (0.77µg/L) was obtained. Intraday relative standard deviation (RSD) was less than 3.6%. The average recovery of the analyte spiked in plastic playground was 96.48%-110.64%.
 

General Posters
7:00 PM-9:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Analytical Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007