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在pH6左右以硫代硫酸钠掩蔽铜,用磺基水杨酸比色法测定黄铜中低含量铁。0.2克试样溶于稀硝酸,相继加入10毫升10%磺基水杨酸,20毫升40%乙酸铵,10～12毫升
Copper was masked with sodium thiosulfate at pH 6 and low content of iron in brass was determined by sulfosalicylic acid colorimetry. 0.2 g sample dissolved in dilute nitric acid, followed by adding 10 ml of 10% sulfosalicylic acid, 20 ml of 40% ammonium acetate, 10 to 12 ml