covered emplacement

Discussion on the Masking and Demasking Problem in Analytical Chemistry Teaching Materials of Pharmaceutical Engineering;

关于制药工程专业分析化学课程教学中掩蔽与解蔽问题的讨论

A Reseach on Masking Method for S~(2-) in Basicity Determination of OH~- CO_3~(2-) and HCO_3~-;

OH~-、CO_3~(2-)和HCO_3~-碱度测定中S~(2-)的掩蔽方法研究

A Diagnosis of Cochlear Hydrops Using ABR under Masking of Pink Noise;

粉红噪声掩蔽下的听性脑干反应诊断早期梅尼埃病

By means of sheltering the chief reductive substances in the total drain sludge one by one and analyzing the changes of COD before and after the shelters,the writer finds out the primary factors which influence the COD.

通过对总排污口污水中主要还原性物质逐项进行掩蔽 ,分析掩蔽前后污水COD值的变化 ,找出了影响COD的主要因素并提出了改进措施 ,使排污总口COD值大幅降

The function of sheltering nitrite from sulfamic acid is compared with that from sodium azidum.

结果表明：海洋监测规范中ＣＯＤ的测定方法不适合于ＮＯ－２较高的污染海水，比较了氨基磺酸与叠氮化钠对ＮＯ－２的掩蔽效果及测定方法。

And adopt active carbon pretreatment,EDTA complexing,NH_4F shelter and pH control resolve these unstabilizing factors.

采取了活性炭预处理、乙二胺四乙酸钠络合、氟化铵掩蔽和酸度控制等方法来解决不稳定性,并且与火法试金分析结果进行对照,结果相符,方法可行。