Microcalorimetry was used to study the enrichment detection process of heavy metal ions. The influence of heavy metal ion injection sequence, sample injection flow rate and carrier resin particle size on the inhibition of urease catalytic reaction by heavy metal ions was optimized by flow injection analysis. The injection parameters of urease and heavy metal ions were obtained, and the optimized parameters of urease immobilization and heavy metal ion enrichment conditions were obtained. The results show that at low flow rates (0 mL 1 mL / min), the particle diameter of the carrier resin is 0 mL 5 ~ 0 Under the conditions of 6 mm, urease injection volume of 3 mL, and heavy metal ion injection volume of 5 mL, the enrichment of heavy metal ions is performed first, and then the effect on the catalytic reaction of immobilized urease is detected to obtain a better detection effect. In the experimental concentration range, the order of the four heavy metal ions to urease catalyzed reaction is arsenic ion> copper ion> cadmium ion> lead ion. In this paper, the heavy metal ion was appropriately enriched to reduce its lower detection limit. The thermal method for rapid detection of heavy metal ions provides a theoretical basis.
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