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以碘化钾为预还原剂,同时消除银、铜基体对锑的干扰,在稀硝酸介质中,用KBH_4为还原剂,利用无载气氢化物发生器产生的SbH_3气体被喷雾器产生的负压吸入雾室再进入火焰原子化,获得锑的吸收灵敏度比溶液法高600倍,绝对检出极限(2σ)4.5ng,相对标准偏差为1.5％。 水、食品,地质样品、铜材料中锑的氢化法测定已有报导,纯银、银铜合金中锑的氢化法做的较少,大量基体对SbH_3的产生有严重干扰。本法用碘化钾将锑(Ⅲ、ⅴ)络合为碘化锑(Ⅲ),余量碘离子与Cu~(++)、Ag~+形成碘化亚铜及碘化银沉淀,从
Using potassium iodide as prereducing agent and eliminating the interference of silver and copper matrix on antimony, using KBH_4 as reductant in the dilute nitric acid medium, the negative pressure generated by the sprayer by the carrier-free hydride generator is sucked into the mist Room re-enter the flame atomization, access to antimony absorption sensitivity 600 times higher than the solution method, the absolute detection limit (2σ) 4.5ng, the relative standard deviation of 1.5%. It has been reported that hydrogenation of antimony in pure silver and silver-copper alloy is less than that of hydrogen in the water, food, geological samples and copper materials. A large number of substrates have a serious interference with the production of SbH_3. This method uses potassium iodide to complex antimony (Ⅲ, ⅴ) into antimony iodide (Ⅲ), with the balance of iodine ion and Cu ~ (++), Ag ~ + to form cuprous iodide and silver iodide precipitate.