土壤酶对碘离子在土壤中吸附行为的影响

以批式试验法研究了微生物、葡萄糖氧化酶、脲酶、纤维素酶及其催化底物葡萄糖、尿素和纤维素对Ⅰ-在土壤中吸附的影响,结果表明微生物能显著提高Ⅰ-吸附量,但葡萄糖氧化酶、脲酶、纤维素酶及葡萄糖、尿素和纤维素对Ⅰ-吸附并无促进作用.葡萄糖氧化酶及葡萄糖含量在小于100 mg/L时对Ⅰ-吸附无影响,1000 mg/L时与Ⅰ-呈竞争吸附;脲酶及尿素随浓度增大,对Ⅰ-吸附的抑制作用变得明显;1～1000 mg/L范围内,纤维素酶和纤维素对Ⅰ-吸附没有影响;但葡萄糖氧化酶和葡萄糖生成的中间产物可促进土壤对Ⅰ-的吸附.平衡液中溶解性有机碳(DOC)含量随时间增加而逐渐降低,有机质浓度越大,降低趋势越明显.

Impact of soil enzyme on adsorption of iodine in soil

Adsorption of iodine in soil was studied with batch test while several typical soil enzymes and microbes existed. Microbes can significantly increase the iodine adsorption capacity in soil,but glucose oxidase,urease,cellulose enzyme,glucose,urea and cellulose cannot. At the concentration of less than 100 mg/L,glucose oxidase or glucose has no effect on iodine adsorption,while at 1000 mg/L,both glucose oxidase and glucose significantly inhibit it. The more urease or urea,the more obvious is the inhibition of iodine adsorption. In the range of 1-1000 mg/L,cellulase and cellulose do not affect the iodine adsorption. Iodine adsorption can be enhanced while glucose oxidase and glucose exited at the same time. Dissolved organic carbon contents in the liquid gradually decrease with time,and the decreasing tendency is obvious with increasing concentration of organic matter.