EDTA标准测定翻译-中英对照
1、概述：
在PH为10左右的缓冲溶液，用铬黑T或酸性铬兰K作指示剂，用EDTA标准溶液进行滴定至纯蓝为终点，根据EDTA消耗量，即可计算出水中钙镁含量。其反应如下：
加指示剂后：
Mg2++Hln2-→Mgln+H+（ln2-为指示剂）
（蓝色） 酒红色
Mgln-+H2Y2→MgY2-+Hln2-+H+
酒红色 蓝色
Me2+代表Ca2+，Mg2+离子
Y4-为乙二胺四乙酸离子。
2、测定方法：
不同硬度的水需取水样体积
水样硬度me/L 需取水样体积（ml）
0.5—5.0 100
5.0—10.0 50
10.0—20.0 55
测硬度大的用浓度大的标准溶液，小硬度用浓度小的标准溶液。
（1）取水样100ml注入250ml锥形瓶中。
（2）加3ml氨—氯化铵缓冲液和二滴指示剂。
（3）在不断摇动下用EDTA标准液滴定至蓝色。
YD含量用下式计算：
M：EDTA标准溶液浓度（mmol/L）
A：滴定所消耗EDTA标准溶液体积（ml）
V：水样体积（ml）
七． 碱度的测定（容量法）
1、概述：
水的碱度是指水中含有能接受氢离子的量，选用适宜的指示剂，用标准酸溶液进行滴定。
碱度可以分酚酞碱度和全碱度两种。酚酞碱度是以酚酞为指示剂时测得的量，终点PH为8.3，全碱是以甲基橙为指示剂测出的量，终点为4.2。
以酚酞为指示剂，滴定反应如下：
OH-+H+→H2O（PH=8.3时,全部完成）
CO33-+H+→HCO3-(PH=8.3时全部完成)
PO43-+H+→HPO43-（PH=8.3时超滴7.4%）
SiO32-+2H+→H2SiO3（PH=8.3时，尚有60%HSiO3-未滴定）
NH3+H+→NH4+（PH=8.3时尚有10.2%NH3未滴定）
再以甲基橙作指示剂，继续滴定。
HCO3-+H+→CO2+H2O（全部完成）
HPO42-+→H2PO4-（剩余部分全部滴完）
HSiO3-+H+→H2SiO3（剩余部分全部滴完）
NH3+H+→NH4+（剩余部分全部滴完）
腐植酸盐+H+→腐植酸
2、测定方法：
（1）量取100ml透明水样于锥形瓶中。
（2）加2—3滴1%酚酞指示剂，若显红色用酸标准液滴定至恰无色消耗量为a。
（3）再加2滴甲基橙指示剂，用酸标准液继续滴定，至橙红色为止，消耗量为b。碱度大小计算如下：
（JD）酚=M•a×10mmol/L
（JD）全= M•（a+b）×10mmol/L
M：标准液浓度。
a：酚碱标准液消耗量。
b：全碱标准液消耗量。
八． 酸度的测定（容量法）
1、概述：
水的酸度是指水中含有能接受氢氧根离子的量。以甲基橙为指示剂，用氢氧化钠标准溶液滴定至橙色为终点（PH约为4.2），测定值只包括强的无机酸，这种酸度称为甲基橙酸度，反应如下：
SD=M•a×10mmol/L
M：标准液浓度。
a：消耗标准液体积。
九． 浊度的测定（比光式浊度法）
1、概述：
水样浑浊程度可以用浊度来表示。水样浑浊的原因是水中含有悬浮物和胶体粒子造成，这些物质对于照射光能发生反射和散射，水样浊度越高，反射光和散射光越强，而透过光越强。比光式浊度计就是利用所产生的散射光与透射光强度间的变化，进行水样浊度测定的。
2、测定方法：
（1）根据水样浊度大小选择滤光片和高低杯。
浊度范围 滤光片和试杯配合 换算（度/格）
0—8 清水，高杯 0.105
8—16 清水，低杯 0.20
8—28 沉淀水，低杯 0.34
10—30 沉淀水，低杯 0.44
15—40 原水，高杯 0.71
15—50 原水，低杯 0.91
（2）把水摇均,倒入试杯，水面至刻度。
（3）盖上盖杯,盖杯底与水面紧贴，无泡。
（4）用滤纸将盖杯，盖杯底和试杯镜座揩试干净，将试杯放入镜座，对准剂线。
（5）关严浊度计小门，勿使漏光。
（6）从目镜看下去，可看到遮中小园孔，孔的明净程度，可以转动刻度盘来调节。调至小园孔的透射光和大园圈的散射光强度一样为好。
透光孔太弱、透光孔正好、透光孔太强。
（7）测定完毕后，立即关灯。
注意： ａ、对浊度大的水样可以稀释后测定。
ｂ、本仪器保持清洁，不被污染。
ｃ、试杯放于桌面上要口朝上。
ｄ、光源乃白灯泡不准用手摸或改变位置。
九． 余氯的测定（邻联甲苯胺比色法）
1、概述：
余氯与邻联甲苯胺生成黄色化合物，根据颜色深度定量。本法测定的是游离性余氯及总余氯。水中悬浮性物质应该除去，干扰物质最高允许含量如下：高铁，0.2mg/l；四价锰，0.01mg/l；亚硝酸盐，0.2mg/l。本法最低检出浓度为0.01mg/l余氯。在PH值小于1.8的酸性溶液中，余氯与邻联甲苯胺反应如下：
HOCL+HCL→[O]
Anode: the anode adopts titanium anode coated with rare metallic oxide specially for electrolyzing seawater which is a patent developed by STDN Company, i.e. DSA®. Aiming at features of water in Southeast Asia, STDN Company focuses on developing the anode for electrolyzing seawater and ensuring that the electrolytic cell can keep good chemical performance and service life within a temperature range of 10～35℃, prolonging the long acid rinsing period and improving electrolytic efficiency. The content of Mn in seawater will have no effect on the normal service life and current efficiency.
The shape of anode is a plate-net type, which increases flow of seawater as well as electrolytic efficiency. The active area of plate-net type anode is larger than that of plate type anode, which increases the yield of chlorine. The PVDF spacer separates the anode and the cathode with an optimal space so as to decrease cell voltage and energy consumption as well.
Cathode: the cathode is made of Hastelloy Alloy. The Hastelloy Alloy has better corrosion resistance than titanium in mediums of seawater and sodium hypochlorite solution, and the hydrogen-evolution potential of this alloy is 0.45V lower than titanium so the power consumption can be decreased by 10～15%. The polished surface of alloy plate reduces precipitates. Comparing with titanium cathode, hardly any hydrogen brittleness or “hydrogen evolutional corrosion thinning phenomenon” will occur during large current, it overcomes the trouble of replacing titanium cathode only using for 4~5 years and permanent application will be realized.
Sealing: the sealing of conduct piece in the cell adopts fluorine rubber o-ring, the shell and lid are sealed with silicone rubber o-ring. These sealing ways and special materials with excellent sealing performance have been proved already.
Metallic parts: all fasteners and structural components in the cell are made of titanium; the material of exterior fasteners is silicon bronze. All fasteners shall be tightly screwed up with wrenches in accordance with regulations so as to ensure the reliability of sealing.
Conduction: the conductive connector of cathode or anode in the electrolytic cell shall be a titanium-copper composite rod, the part inside the cell shall be titanium and the part outside the cell shall be copper in order to prevent corrosion and ensure the good conductivity. Copper bars are applied for connection between cells which is easy to disassemble.
Design: the anode in the electrolytic cell is a single-pole type. The electrolytic cell is upright and seawater flows upwards with a high speed. The hydrogen gas generated by electrolyzing water can be discharged in the same direction with water flow without staying in the cell. The high flow velocity reduces the accumulation of precipitates as calcium and magnesium at the cathode which prolongs acid rinsing period.
2．Equipment Specification：
Current efficiency： 83%
DC consumption： 3.76kWh/kg
AC consumption： 4.43kWh/kg
Service duration of anode： 43800h
Acid rinsing period： 1080h
It adopts the domestic seawater electrolytic cell with a netlike and transparent structure of SC400/1 monopolar type which is produced by introducing the latest technology of Seven-Trent De Nora Company.
Structure of Generator:
Quantity: 2 Sets
Chlorine production rate: ≥65 kg/h. set
Anode lifetime: ≥5 Years
Cathode lifetime: ≥20 Years
Chlorine evolution potential ≤1.13V（S.C.E）
AC consumption ≤3.76kW•h/kg•Cl2
DC consumption ≤4.43kW•h/kg•Cl2
Electrode material: Anode adopts DSA﹫Anode (inlet )
Cathode is made of Hastelloy alloy C
Acid rising period: ≥1080h
武汉翻译公司
2013.7.10