Determination of Chromium, Cobalt, Iron, Manganese, and Nickel in Silver by Atomic Absorption Spectrophotometry

The determination of chromium, cobalt, iron, manganese and nickel by atomic absorption spectrophotometry in silver and silver alloys has been investigated. Samples containing from 2 μg to more than 500 μg in a two-gram sample of silver can be determined by using the same procedure. A series of twenty samples for each element at different concentrations gave an average standard deviation from linear regression analysis of 2.1% for iron, 1.97% for chromium, 2.9% for nickel, 1.6% for manganese and 2.8% for cobalt. The time required for analysis of these five elements in a two-gram sample, including sample dissolution and standard preparation, is approximately three and a half hours.