掩蔽剂是指用以掩蔽干扰离子的试剂。分析化学中的所谓“掩蔽”，是指离子或分子无须进行分离而仅经过一定的化学反应(通常是形成络合物)即可不再干扰分析反应的过程。对于有干扰的离子或分子，如不用分离的方法,则必须借助于掩蔽手段。常用的掩蔽剂有无机掩蔽剂和有机掩蔽剂两大类。有机掩蔽剂品种更多，效果更好，得到了更多的研究和应用。
考察了显色剂用量、掩蔽剂用量及显色时间与吸光度的关系。
The relationship between the absorbency and the dosages of developer, and of the masking agent has been investigated.
介绍ED TA容量法测定萤石中氟化钙时所使用的主要试剂、掩蔽剂等的选择。
The selection of main reagents and screening agents has been introduced for measuring the calcium fluoride in fluorite by EDTA volumetric method.
为此，以双氧水、铜铁试剂为掩蔽剂和除杂剂，对该含钒酸浸液进行了除杂净化试验。
For this, hydrogen peroxide and cupferron were used as screening agent and agent for removing impurities in the test of purifying this vanadium-containing acid leaching solution.
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