Determination of impurities in sodium by lanthanum hydroxide carrier

salts after concentration precipitation with 8-quinolinol, tannic acid, and thionalide (I, 2) have been reported. Scarborough et al. (3, 4) used lanth...
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concentration as the blank, partly because of a small amount of copper impurity in the tannic acid. Determinations of copper in the samples by atomic absorption (Table 111) without using organic enrichment techniques showed this low concentration (