Predictive phase equilibria for the aqueous ternary system(Li_2SO_4 + K_2SO_4 + H_2O) from 273.15 to 373.15 K

正1 Introduction Many variable temperature chemical models were developed to predict mineral solubility in the natural waters(Na+,K+,Ca2+,Mg2+//Cl-,SO42-–H2O)in the temperature range below 298.15 K(to near 213.15 K)and(Na+,K+,     

高频熔样等离子体发射光谱标准加入法测定刚玉中硅钛

以Li2B4O7 为熔剂高频电感熔样,等离子体发射光谱标准加入法测定了刚玉中的硅和钛。方法的检出限Si为0. 05mg/L,Ti为0. 02mg/L;线性浓度上限Si为40mg/L,Ti为80mg/L;回收率为95. 2% ~104. 3%;RSD(n=6)为0. 88% ~1. 36%。     

单扫描示波极谱法测定痕量钒

提出单扫描示波极谱测定痕量Ｖ的极谱催化波体系，选定４．８×１０￣－６ｍｏｌ／Ｌ　ＰＡＲ－０．０４８％Ｈ＿２Ｏ＿２－０．０２５ｍｏｌ／ＬＮａＢｒＯ＿３－０．００３ｍｏｌ／ＬＨ＿２ＳＯ＿４的底液条件，测定Ｖ的线性范围为０．０４～１２ｎｇ／ｍｌ，检出限０．０２ｎｇ／ｍｌ。将该体系应用于水样、人发及矿样中痕量Ｖ的测定，结果满意。