IC Determination of Trace Amount of N-(2-Hydroxyethyl)-ethylene Diamine in Textile Sizing Agent

IC was applied to the determination of trace amounts of N-(2-hydroxyethyl)-ethylene diamine (HEEDA) in textile sizing agent. The sample (1.0 g) was mixed and made up to 25 mL with water, and then dispersed ultrasonically for 40 min. After centrifuged, the supernatant was taken and passed through OnGuard RP column to remove aromatic dyes and other macromolecular organic substances. An aliquot of 25 μL of the sample solution was separated on Ionpac CS17 cationic exchange column with 8 mmol·L-1 H2SO4 solution as mobile phase. The suppressed conductivity detector was adopted in the IC determination. Linear relationship between values of peak area and mass concentration of HEEDA was kept in the range of 0.1 to 100 mg·L-1, with detection limit (3S/N) of 0.025 mg·L-1. Repeatability was tasted on standard solution with 50 mg·L-1 of HEEDA, value of RSD (n=5) found was 0.71%. Recovery was tested by standard addition method using 2 positive samples of sizing agents, as matrixes, giving values of recovery in the range of 95.4%-104%.