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1样品NMIJ白米认证标准物质(NMIJ CRM7503-a);NMIJ玄米认证标准物质(NMIJ CRM7532-a)。2样品前处理(不同形态砷的萃取)称取0.5g样品放入14mL离心管中,加入2mL 0.15 M硝酸溶液,搅拌。在恒温仪中于100℃加热6h,用纯水定容至10 mL。以3 000r/min离心分离20min,经0.45μm滤膜过滤,取上清液。将过滤液用流动相稀释2倍,作为待测液。各样品做3个平行样。
1 Sample NMIJ White Rice Certified Reference Material (NMIJ CRM7503-a); NMIJ Dark Rice Certified Reference Material (NMIJ CRM7532-a). 2 sample preparation (different forms of arsenic extraction) Weigh 0.5g sample into 14mL centrifuge tube, add 2mL 0.15 M nitric acid solution, stirring. In a thermostat at 100 ℃ heating 6h, with pure water to volume 10mL. Centrifugation at 3 000r / min 20min, 0.45μm membrane filtration, the supernatant. The filtrate was diluted 2 times with mobile phase, as the test solution. Each sample to do 3 parallel samples.