由于背景干扰严重并且灵敏度较低,用火焰原子吸收法和无焰法测定地质样品中痕量砷,往往需要进行预分离。氢化法因其灵敏度高和事实上进行了预分离,能得到稳定的结果,因而获得广泛应用。氢化物原子吸收分光光度法测定砷,其相对灵敏度与所用仪器能够检测出的绝对灵敏度和测试条件有密切关系。通常为了提高测试相对灵敏度,采用预加辅助还元剂的办法,将共存的可还元性物质与砷(V)预先还元至低价状态,借以提高试样进样量和测砷灵敏度从而获 Due to the heavy background interference and low sensitivity, flame atomic absorption spectrometry and flameless determination of trace amounts of arsenic in geological samples often require pre-separation. Hydrogenation is widely used because of its high sensitivity and the fact that it is preseparated and gives stable results. Determination of arsenic hydride by atomic absorption spectrophotometry, the relative sensitivity of the instruments used and can detect the absolute sensitivity and test conditions are closely related. Usually in order to improve the relative sensitivity of the test, a pre-additive auxiliary reducing agent is used to reduce the co-existing saliva and arsenic (V) to a low state in advance so as to increase the sample injection volume and the sensitivity of arsenic Won