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本文报道了树脂相分光光度法测定地质样品中微量镁的研究。结果表明，利用国产７３２＃阳离子交换树脂作为载体，在碱性介质中，镁离子能够与镁试剂Ⅱ形成稳定的兰色配合物，使树脂载体里兰色，配合物的最大吸收波长为６５０ｎｍ，方法集分离、富集和测定于一体，其摩尔消光系数ε＝１．１２×１０５，ＲＳＤ＝５．３％，镁含量在０～３４μｇ／２５０ｍｌ范围内与吸收值Ａ成良好的线性关系，方法已应用于地质样品中微量镁的测定，取得满意的结果。
This paper reports the determination of trace magnesium in geological samples by resin phase spectrophotometry. The results show that the use of domestic 732 # cation exchange resin as a carrier, in alkaline medium, magnesium ions can form a stable blue complex with magnesium reagent Ⅱ, the resin carrier blue, the maximum absorption wavelength of the complex was 650nm, The method has the advantages of separation, enrichment and determination. The molar extinction coefficient ε = 1.12 × 105, RSD = 5.3%, and the magnesium content in the range of 0 ~ 34μg / 250ml has a good linear relationship with the absorption value A, The method has been applied to the determination of trace magnesium in geological samples with satisfactory results.