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。
To find out a method which not only shorten time,save money and decrease pollution,but also satisfy requirements for setting out chemical oxygen demand(COD),the CODs were quickly determined by mercury-free potassium dichromate method using MnSO4 as catalyst and AgNO3,KCr(SO4)2·12H2O as masking agent of Cl-in sulfuric-phosphoric mixed acid.
12H2O作Cl-的掩蔽剂,采用重铬酸钾氧化法,无汞快速测定COD。
In this method the masking agent is directly introduced into the determination to eliminate the interference of interfereing elements.
直接加入掩蔽剂消除铅测定中干扰元素对铅的干扰,用此方法对铅铋合金中的铅进行了准确的测定,取得了很好的准确度和重现性。
The pH of both the beginning precipitation and the completion of precipitation,of the slightly soluble compounds,can be determined very conveniently through the logα M(L) -pH curve masking diagram under the conditions of the existence of masking agent.
本文提出的图解法 ,可极为简便地确定掩蔽剂存在时微溶物开始沉淀及沉淀完全时的ｐＨ值 ,比文献[1～ 3 ] 方法易于求解 ,计算简便。