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。
This article designs a new EDTA complex-formation method,which is to assay calcium carbonate content in coated abrasive tools unit area,through cupferron instead cyanide as screening agent,Satisfactory results can be obtatined.
以铜试剂代替氰化物作掩蔽剂 ,用EDTA容量法测定涂附磨具单位面积CaCO3 含量 ,获得了满意的效果。
Analysis of Effects of Phosphate Masking Agent in Boiler Water
锅炉炉水中磷酸盐掩蔽剂的掩蔽效果分析
The Influences of the Masking Agent on the Determination Results of COD
COD测定中掩蔽剂对测定结果的影响
The Influences of Optimum Acidity Range by Masking Agent in Extraction Spectrometric Determination
掩蔽剂对萃取光度分析适宜酸度范围的影响
The relationship between the absorbency and the dosages of developer, and of the masking agent has been investigated.
考察了显色剂用、掩蔽剂用量及显色时间与吸光度的关系。
On the Photometric Determination of Nickel with Dimethylglyoxime Using Potassium Sodium Tartrate and EDTA as Masking Agent
酒石酸钾钠—乙二胺四乙酸二钠作掩蔽剂丁二酮肟测镍的方法研究
The Study and Application of the Descriptive Chemistry of the Masking Agent in Fast Chemical Analysis;
快速化学分析中掩蔽剂的作用规律及其应用研究
Something that provides shelter.
掩护物提供掩蔽的事物
We scattered for cover in the bombing.
轰炸时我们分散掩蔽。
The lids were occulting her eyes.
眼睑掩蔽了她的眼睛。
implant masking step
离子注入用掩蔽工序
oxide nitride masking
氧化物 氮化物掩蔽
photoresist controlled etch
光刻胶掩蔽控制腐蚀
fire from coverts
从掩蔽处射击,2. 隐蔽;掩饰[U]3. 【鸟】覆羽[C][P1]
clinical observation of the relationship between tinnitus maskingcurve and masking therapy result
耳鸣掩蔽曲线与掩蔽治疗效果关系的临床观察
Object Substitution Masking:Progress in Visual Backward Masking
客体替代掩蔽:视觉后向掩蔽研究的新进展
The act of occulting or the state of being occulted.
隐伏掩蔽的行为或被荫蔽的状态
The noise occultation was significant, and the undertone was the easiest one to be occulted.
噪音对信号的掩蔽作用显著，其中低音最易被掩蔽。
Forward Masking Effects of Static and Dynamic Frequency Maskers on the Response of Inferior Collicular Neurons in Mouse;
静态与动态掩蔽声对小鼠下丘神经元声反应的前掩蔽效应