微分脈沖極譜測定痕量鉈的研究

在pH值為5～10的范圍內(nèi)，鉈(I)與4-嗎啉二硫代羧酸鉀生成不溶于水的螯合物并定量的吸附在微晶萘的表面上。用15 ml的1.5 mol/L的HCl使該不溶性螯合物脫附溶解后，在滴汞電極(DME)上用微分脈沖極譜(DPP)法測定痕量的鉈(I)取得了很好的效果。該分析方法的檢測限達到0.025 μg/ml，所測定的鉈(I)濃度的線性范圍達到0.05～10 μg/ml，標(biāo)準(zhǔn)曲線的相關(guān)系數(shù)γ = 0. 999 5，相對標(biāo)準(zhǔn)偏差為± 0.90。
關(guān) 鍵 詞 鉈; 微分脈沖極譜; 滴汞電極; 4 -嗎啉二硫代羧酸鉀

After Tl(I)- morpholine-4-carbodithioate complex is formed by the complex reaction of Tl(I) with morpholine-4-carbodithioate, the Tl(I) complex is quantitatively adsorbed onto
microcrystalline naphthalene in the range of pH=5～10.The trace amount of thallium is determined by differential pulse polarography on DME after the adsorption of its morpholine-4-carbodithioate is decomposed in 15 ml of 1.5 mol/L HCl. The detection limit of thallium is 0.025 μg/ml and the linear range of concentration is 0.05～10 μg/ml with a correlation coefficient of 0.999 5 and a relative standard deviation of ±0.90.