以往的测砷方法均须先经过湿消化或干灰化的办法以破坏样品的有机质。曾有人报告过干灰化过程中砷有丢失。作者用湿消化法测海鱼、国家标准局在果树叶和海鱼中加入标准砷的样品,方法烦琐费时,回收和重复性不好。为此,作者研究出下述的干灰化法。样品含砷量的测定则系使用Gutzeit的方法。准确称取1～4克湿重(约0.5克干重)鱼体组织匀浆于50毫升坩埚中,加入8毫升50%硝酸镁,于红外线灯下烤到 Previous arsenic determination methods must first wet digestion or dry ashing methods to destroy the sample of organic matter. Some people have reported loss of arsenic during the dry ashing process. The authors test the fish by wet digestion. The National Bureau of Standards added standard samples of arsenic in fruit leaves and marine fish. The method is cumbersome, time consuming, and poor in recovery and reproducibility. To this end, the authors developed the following dry ashing method. Determination of arsenic content in the sample is the use of Gutzeit method. Accurately weighed 1 to 4 grams of wet weight (about 0.5 g dry weight) of fish tissue homogenate in 50 ml crucible, add 8 ml of 50% magnesium nitrate, roasted under an infrared lamp