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应用氢化物-无色散原子荧光法测定灵敏度低的元素如砷、硒、铋、锡和锑等已获得很高的灵敏度。有人将该技术用于土壤中硒的测定,由于铜的严重负干扰,他们采用硝酸镧二次沉淀或碲(Ⅳ)消除干扰,但使硒的检出限下降30%(实际检出限为10ppb)。国内有人用同样的技术测定煤灰水、生物样品中硒,检出限为0.2ppb。我们在此基础上探求了适用于土壤等样品的消化、反应酸度及还原条件,使该技术的检出限达到0.08ppb,应用于土壤、大米和茶叶中微量硒的测定,结果满意。
The use of hydride-free atomic fluorescence spectrometry for the determination of less sensitive elements such as arsenic, selenium, bismuth, tin and antimony has achieved very high sensitivity. Some people use this technology for the determination of selenium in soil. Due to the serious negative interference of copper, they use secondary precipitation of lanthanum nitrate or tellurium (Ⅳ) to eliminate interference, but the detection limit of selenium is reduced by 30% (the actual detection limit is 10ppb). Some people use the same technology for determination of coal ash water, biological samples of selenium, the detection limit of 0.2ppb. On this basis, we have explored the digestion, reaction acidity and reduction conditions suitable for soil samples, the detection limit of this technology reached 0.08ppb, and was applied to the determination of trace selenium in soil, rice and tea with satisfactory results.