【摘要】：取經(jīng)清洗、粉碎并烘干的樣品0.500 0g,用硝酸5mL及過氧化氫3mL,按程序升溫模式微波消解。消解液于沸水浴中蒸發(fā)至約1mL,用水定容至50mL。取此溶液5.00mL依次加入0.2g·L~(-1) 5-Br-PADAP溶液2.0mL,氨性緩沖溶液(pH 9.0)3.0mL及100g·L~(-1) Triton X-114溶液3.0mL,加水定容至25mL,搖勻,使Cd~(2+)生成絡(luò)合物,10min后加入辛醇1.0mL,渦旋混合1min,離心5min,吸出下層溶液,取出上層紅色有機層,用乙醇定容至3mL,于540nm處用1cm比色皿測得其吸光度。鎘的質(zhì)量濃度在10.00mg·L~(-1)以內(nèi)與吸光度呈線性關(guān)系,檢出限(3s)為0.05mg·L~(-1)。加標回收率為93.3%~103%,測定值的相對標準偏差(n=6)小于5.0%。
[Abstract]:The sample, which was cleaned, crushed and dried, was digested with nitric acid 5mL and hydrogen peroxide 3 mL, and digested by microwave in temperature programmed mode. The hydrolysate evaporated to about 1 mL in boiling water bath and fixed volume to 50 mL with water. The solution 5.00mL was added to 0.2 g 路L ~ (- 1) 5-Br-PADAP solution 2.0 mL, ammonia buffer solution (pH 9.0) 3.0mL and 100g 路L ~ (- 1) Triton X 鈮，

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