Determination of chromium content in potato by graphite furnace atomic absorption spectrometry

Graphite furnace atomic absorption spectrometry was used to determine content of chromium,and a comparison was made between a new wet digestion(nitric acid,hydrogen peroxide and sulfuric acid) and traditional wet digestion(nitric acid and perchloric acid) for pretreatment.The results showed that the content of Cr measured with new wet digestion method is slightly higher than that of traditional digestion method measured chromium,the recovery rate was 92.7% ~ 99.2% and RSD of precision was1.713 5%,the new wet digestion method is better than the traditional,the larger risk of perchloric acid was avoided,and the mild reaction conditions,safe operation,simple,complete digestion,accurate,and can be used as a selection method was applied in practical work.