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Determination of Hexavalent Chromium in Solid Waste by Ultra Trace Hexavalent

Chromium Analyzer with Ultrasound-Assisted Alkali Extraction

WU Xiaolong, LI Xiaomin , FU Shijin, ZHANG Lin, HUANG Yujie, XU Lizhi
*
(Hainan Province Ecological and Environmental Monitoring Centre, Haikou 571126, China)
Abstract: In order to solve the current problems of long time consuming, low extraction efficiency and matrix interference
on detection of hexavalent chromium in soild waste, hexavalent chromium in solid waste was determined by ultra trace
hexavalent chromium analyzer combined with ultrasonic extraction and post-column derivatization ion chromatography. The
solid waste sample (2. 0 g) was taken into a 50 mL-colorimetric tube, followed by 40 mL of alkaline extraction reagent including
20 g · L − 1 sodium hydroxide and 30 g · L − 1 sodium carbonate, 0. 4 g of magnesium chloride and 0. 5 mL of buffer solution
− 1 − 1
including 68. 7 g · L dipotassium hydrogen phosphate and 87. 1 g · L potassium dihydrogen phosphate, and the mixture
was shaken well, and extracted by ultrasound at a power of 50 W for 45 min. The extract was centrifuged for 10 min, and the
supernatant was taken, and made its volume to 50 mL with water. Hexavalent chromium was determined by ion chromatography
using a solution containing 0. 67% (volume fraction) nitric acid and 1% (volume fraction) ammonia water (pH 8−9) as the eluent
for isocratic elution and 1% (volume fraction) sulfuric acid solution containing 0. 8 g · L −1 diphenylcarbazide as the derivatizing
agent. As shown by the results, linear relationship between the corresponding peak area and mass concentration of hexavalent
• 310 •