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三价铬为人体所必需,六价铬对人体有毒害作用。三价铬为胰岛素发挥生化作用的辅助因子,缺铬胰岛素活性降低,严重缺乏者出现糖尿病。另外,铬与胆固醇、脂肪代谢密切相关,缺铬时血液内脂肪及胆固醇含量增加,而发生动脉粥样硬化。铬亦与蛋白质代谢有关,缺铬时动物生长发育停滞,角膜混浊,死亡率增高。补铬后生长加速,寿命延长。铬也对血红蛋白合成及造血过程具有促进作用。因此,准确地测定铬对防止铬的污染、保障人体健康具有重大意义。我们对重铬酸盐中的铬在N-亚硝基苯胲胺(又名铜铁试剂)体系中的极谱性能进行了研究,发现在碱性介质中重铬酸
Trivalent chromium is essential for the human body and hexavalent chromium is toxic to the human body. Trivalent chromium is a cofactor for insulin to play a biochemical role. Chromium-deficient insulin activity is reduced and diabetes is severely lacking. In addition, chromium is closely related to cholesterol and fat metabolism. In the absence of chromium, blood fat and cholesterol levels increase, and atherosclerosis occurs. Chromium is also involved in protein metabolism. In the absence of chromium, animal growth and development stagnate, corneal opacity, and increased mortality. Accelerated growth after replenishing chromium, extending the life span. Chromium also has a promoting effect on hemoglobin synthesis and hematopoiesis. Therefore, it is of great significance to accurately measure chromium to prevent chromium pollution and protect human health. We have studied the polarographic properties of chromium in dichromate in N-nitrosobenzamide (also known as copper-iron reagent) system and found that dichromic acid is in alkaline medium.