经常采用的顾特蔡特(Gutzeit)改良的胂——溴化汞试纸测定砷,灵敏度为3×10~(-6)克。当前,此方法已广泛应用于医药、化学试剂、合金等领域进行微量砷的测定。由于此法是用眼观察,所以准确度较差。为了克服方法的弱点,日本人藉用光学仪器反射计进行砷的斑点测定,准确度有所改进,灵敏度也有提高。为:1×10~(-7)～8×10~(-7)克。我们以三 The arsenic-mercury bromide test strip, often used by Gutzeit, was used to determine arsenic with a sensitivity of 3 × 10 -6 grams. Currently, this method has been widely used in medicine, chemical reagents, alloys and other fields for the determination of trace arsenic. Because this method is to use the eye observation, so the accuracy is poor. In order to overcome the weakness of the method, the Japanese borrowed the optical instrument reflectometer for the determination of arsenic, the accuracy is improved, and the sensitivity is improved. As follows: 1 × 10 ~ (-7) ~ 8 × 10 ~ (-7) g. We take three