Abstract：Accurate determination of migratory chromium(Ⅵ) in toy materials is very important to ensure the material safety. The sample was extracted with 0.07 mol/L hydrochloric acid. The determination method of trace migratory chromium(Ⅵ) in toy materials by ion chromatography-inductively coupled plasma mass spectrometry (IC-ICP-MS) was established under the following experimental conditions:IonPac AG7 anion chromatographic column was used; the mobile phase was 75 mmol/L ammonium nitrate at pH7.0; the flow rate of mobile phase was controlled at 1.0 mL/min; the sample amount was 200 μL. Under the optimized experimental conditions, the mass concentration of Cr(Ⅵ) in range of 0.005-1.000 μg/L showed good linear to the corresponding peak height with the correlation coefficient of 0.999. The limit of detection and limit of quantification was 0.006 μg/L and 0.02 μg/L, respectively. The standard solution with concentration of 0.1 μg/L was determined, and the relative standard deviation (RSD, n=7) of determination results was less than 3%. The blank toy clay sample where Cr(Ⅵ) was not detected was used for standard addition recovery test. The results showed that the recovery of two concentrations was 96% and 104%, respectively. Three types of toy samples with different colors, including toy clay (type Ⅰ), bubble water (type Ⅱ) and building block coating (type Ⅲ), were analyzed according to the experimental method. The results indicated that Cr(Ⅵ) was not detected from toy clay and bubble water samples, while the content of migratory chromium(Ⅵ) in children’s building block coating was detected (0.023 8 mg/kg). The RSD (n=7) was 6.4%, and the recoveries were between 91% and 110%.
胡锐, 屈华阳, 王小龙, 文桦, 李曼, 沈学静. 离子色谱-电感耦合等离子体质谱联用测定玩具材料中痕量可迁移六价铬[J]. 冶金分析, 2021, 41(7): 17-22.
HU Rui, QU Huayang, WANG Xiaolong, WEN Hua, LI Man, SHEN Xuejing. Determination of trace migratory chromium(Ⅵ) in toy materials by ion chromatography-inductively coupled plasma mass spectrometry. , 2021, 41(7): 17-22.
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