EDTA標(biāo)準(zhǔn)測定翻譯-中英對照
1、概述：
在PH為10左右的緩沖溶液，用鉻黑T或酸性鉻蘭K作指示劑，用EDTA標(biāo)準(zhǔn)溶液進(jìn)行滴定至純藍(lán)為終點，根據(jù)EDTA消耗量，即可計算出水中鈣鎂含量。其反應(yīng)如下：
加指示劑后：
Mg2++Hln2-→Mgln+H+（ln2-為指示劑）
（藍(lán)色） 酒紅色
Mgln-+H2Y2→MgY2-+Hln2-+H+
酒紅色 藍(lán)色
Me2+代表Ca2+，Mg2+離子
Y4-為乙二胺四乙酸離子。
2、測定方法：
不同硬度的水需取水樣體積
水樣硬度me/L 需取水樣體積（ml）
0.5—5.0 100
5.0—10.0 50
10.0—20.0 55
測硬度大的用濃度大的標(biāo)準(zhǔn)溶液，小硬度用濃度小的標(biāo)準(zhǔn)溶液。
（1）取水樣100ml注入250ml錐形瓶中。
（2）加3ml氨—氯化銨緩沖液和二滴指示劑。
（3）在不斷搖動下用EDTA標(biāo)準(zhǔn)液滴定至藍(lán)色。
YD含量用下式計算：
M：EDTA標(biāo)準(zhǔn)溶液濃度（mmol/L）
A：滴定所消耗EDTA標(biāo)準(zhǔn)溶液體積（ml）
V：水樣體積（ml）
七． 堿度的測定（容量法）
1、概述：
水的堿度是指水中含有能接受氫離子的量，選用適宜的指示劑，用標(biāo)準(zhǔn)酸溶液進(jìn)行滴定。
堿度可以分酚酞堿度和全堿度兩種。酚酞堿度是以酚酞為指示劑時測得的量，終點PH為8.3，全堿是以甲基橙為指示劑測出的量，終點為4.2。
以酚酞為指示劑，滴定反應(yīng)如下：
OH-+H+→H2O（PH=8.3時,全部完成）
CO33-+H+→HCO3-(PH=8.3時全部完成)
PO43-+H+→HPO43-（PH=8.3時超滴7.4%）
SiO32-+2H+→H2SiO3（PH=8.3時，尚有60%HSiO3-未滴定）
NH3+H+→NH4+（PH=8.3時尚有10.2%NH3未滴定）
再以甲基橙作指示劑，繼續(xù)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）
腐植酸鹽+H+→腐植酸
2、測定方法：
（1）量取100ml透明水樣于錐形瓶中。
（2）加2—3滴1%酚酞指示劑，若顯紅色用酸標(biāo)準(zhǔn)液滴定至恰無色消耗量為a。
（3）再加2滴甲基橙指示劑，用酸標(biāo)準(zhǔn)液繼續(xù)滴定，至橙紅色為止，消耗量為b。堿度大小計算如下：
（JD）酚=M•a×10mmol/L
（JD）全= M•（a+b）×10mmol/L
M：標(biāo)準(zhǔn)液濃度。
a：酚堿標(biāo)準(zhǔn)液消耗量。
b：全堿標(biāo)準(zhǔn)液消耗量。
八． 酸度的測定（容量法）
1、概述：
水的酸度是指水中含有能接受氫氧根離子的量。以甲基橙為指示劑，用氫氧化鈉標(biāo)準(zhǔn)溶液滴定至橙色為終點（PH約為4.2），測定值只包括強(qiáng)的無機(jī)酸，這種酸度稱為甲基橙酸度，反應(yīng)如下：
SD=M•a×10mmol/L
M：標(biāo)準(zhǔn)液濃度。
a：消耗標(biāo)準(zhǔn)液體積。
九． 濁度的測定（比光式濁度法）
1、概述：
水樣渾濁程度可以用濁度來表示。水樣渾濁的原因是水中含有懸浮物和膠體粒子造成，這些物質(zhì)對于照射光能發(fā)生反射和散射，水樣濁度越高，反射光和散射光越強(qiáng)，而透過光越強(qiáng)。比光式濁度計就是利用所產(chǎn)生的散射光與透射光強(qiáng)度間的變化，進(jìn)行水樣濁度測定的。
2、測定方法：
（1）根據(jù)水樣濁度大小選擇濾光片和高低杯。
濁度范圍 濾光片和試杯配合 換算（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）把水搖均,倒入試杯，水面至刻度。
（3）蓋上蓋杯,蓋杯底與水面緊貼，無泡。
（4）用濾紙將蓋杯，蓋杯底和試杯鏡座揩試干凈，將試杯放入鏡座，對準(zhǔn)劑線。
（5）關(guān)嚴(yán)濁度計小門，勿使漏光。
（6）從目鏡看下去，可看到遮中小園孔，孔的明凈程度，可以轉(zhuǎn)動刻度盤來調(diào)節(jié)。調(diào)至小園孔的透射光和大園圈的散射光強(qiáng)度一樣為好。
透光孔太弱、透光孔正好、透光孔太強(qiáng)。
（7）測定完畢后，立即關(guān)燈。
注意： ａ、對濁度大的水樣可以稀釋后測定。
ｂ、本儀器保持清潔，不被污染。
ｃ、試杯放于桌面上要口朝上。
ｄ、光源乃白燈泡不準(zhǔn)用手摸或改變位置。
九． 余氯的測定（鄰聯(lián)甲苯胺比色法）
1、概述：
余氯與鄰聯(lián)甲苯胺生成黃色化合物，根據(jù)顏色深度定量。本法測定的是游離性余氯及總余氯。水中懸浮性物質(zhì)應(yīng)該除去，干擾物質(zhì)最高允許含量如下：高鐵，0.2mg/l；四價錳，0.01mg/l；亞硝酸鹽，0.2mg/l。本法最低檢出濃度為0.01mg/l余氯。在PH值小于1.8的酸性溶液中，余氯與鄰聯(lián)甲苯胺反應(yīng)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
武漢翻譯公司
2013.7.10