流动注射光度法测定江西两种稀土矿中的稀土总量

DETERMINATION OF TOTAL RARE EARTH IN TWO KINDS OF RARE EARTH ORES OF ABSORBED FORM IN JIANGXI BY FLOW INJECTION-SPECTROPHOTOMETRY

建立了流动注射（ＦＩＡ）光度法测定江西两种离子吸附型稀土矿中稀土总量的新方法。以稀硫酸溶液（ｐＨ＝０．９）为载液，偶氮氯膦Ⅲ作显示剂，记录了６７５ｎｍ处偶氮氯膦Ⅲ———稀土络合物的吸光度，测定了江西龙南、寻乌稀土矿中稀土总量，两种稀土的线性范围分别为０～７ｍｇ／Ｌ，０～９ｍｇ／Ｌ，进样频率达１２０样／ｈ，相对标准偏差为０９％。

A flow injection-spectrophotometric method was proposed for determination of total rare earth of rare earth ores of absorbed form with CPAⅢ in the presence of H 2SO 4.The total rare earth in rare earth ores in Long Nan and XinWu,Jiangxi were determined by measuring the absorbance of CPAⅢ and rare earth at 675 nm.The absorbance was linear with the mass concentration of two kinds rare earth in the range of 0～7 mg/L and 0～9 mg/L,respectively.The sampling rate was 120 samples/h and relative standard deviation (2 mg/L) was 0.9%.The method has been used to determination of the total rare earth in two kinds rare earth ores of absorbed form in Jiangxi with satisfactory results.