The main methods now to evaluate Pb availability in soil are chemical extraction, plant adsorption, microbial and enzyme activation and isotopes tests.
目前，评价土壤中金属植物有效性的方法主要有：化学提取法、植物吸收试验、微生物和酶活性试验及同位素法。
Feasibility and process are discussed in severe corrosion environment; and availability of such kind of inspection on chemical equipment is discussed through primary analysis of its economics.
讨论在强腐蚀环境中使用不锈钢衬里的可行性及工艺，通过对其经济性的初步分析，探讨此类检修方法对化工设备检修中的实用性。
The availability of mineral nutrients for plants is determined by the chemical, physical and biological characteristics of soils, especially by root-induced changes in the rhizosphere.
养分的有效性是由土壤物理、化学和生物学特性，特别是根系主导的根际动态过程所决定的。
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