含甘氨酸钙水溶性钙肥的制备研究

研究旨在开发一种含甘氨酸螯合钙的液体型钙肥，以期使植物更快更有效地得到钙元素的补充。以甘氨酸和四水硝酸钙为原料，采用正交实验法考察原料配比、反应温度、反应溶液pH及反应时间对反应效果的影响，采用EDTA滴定法测定钙含量，采用醇沉法测定螯合率。结果表明：最佳工艺条件为n（甘氨酸）:n（四水硝酸钙）=1.5:1，反应温度为50℃，反应溶液pH 5.5，反应时间1 h。在此条件下制成的水溶性钙肥中总钙含量为103.38 g/L，其中螯合钙含量为58.91 g/L，螯合率达到56.98%。该方法获得了总钙含量符合农业行业标准的高螯合率的液体型钙肥。

Preparation of Water-soluble Calcium Fertilizer Containing Calcium Glycinate

The study aims to prepare a water-soluble calcium fertilizer which containing calcium glycinate, in order to make calcium absorbed by plant more quickly and efficiently. Glycine and calcium nitrate tetrahydrste were used as the raw materials, and orthogonal experimentation were used to investigate the effect of raw materials ratio, reaction temperature, solution pH and the reaction time on the reaction results. The calcium content was measured by EDTA titration, and the chelating rate was measured by alcohol precipitation. The optimum technological conditions were that mole ratio of glycine to calcium nitrate tetrahydrate was 1.5:1, reaction temperature was 50℃, solution pH was 5.5, and reaction time was 1 h. Under these conditions, the total calcium content was 103.38 g/L, chelated calcium was 58.91 g/L, and chelating rate was 56.98%. By this method, a water-soluble calcium fertilizer possessed of appropriate total calcium content can be gotten, and it is in line with the agricultural industry standards of high chelating rate type liquid calcium fertilizer.