Chromium is not only an essential trace element for animals,but also one of the confirmed carcinogens,and its toxicity is related to the total content and speciation of chromium intake.Chromium deficiency will slow down the growth rate,affect the metabolism of nutrients,and cause disorders;Excessive chromium will lead to poisoning or even death,so it is neces-sary to detect the total content,and select appropriate pretreatment methods to reduce the loss of chromium in the pretreat-ment.The toxicity of trivalent chromium is relatively low,while the toxicity of hexavalent chromium is high.Because of the mutual transformation between chromium speciation,it is important to ensure the stability of chromium form during pretreat-ment and detection for the accuracy of results.In this paper,the research status of total chromium and chromium morphology in feed and other industries in recent years was reviewed from the aspects of sample pretreatment methods and detection tech-niques,and their advantages and disadvantages were discussed.The problems and development direction of total chromium and chromium morphology analysis in feed were summarized.
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