Methods The nitric acids fromdifferent habitats were used to carry on the blank test with the perchloric acid,the digestion blank value was assayed.

• 方法:使用实验室现有不同产地的硝酸与高氯酸进行空白试验,测定消化空白值。结果:不同产地的硝酸参与消化,测定铁锌的空白值有差异;