环境水中物理指标检测方案

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Julobo VISCOAnalysis And Testing TechnologyApplication Application Use This method is used for the quantitative determination of total hardness in drinking water. The total hardness is the sum of calcium and magnesium hardness. It is possible to titrate the Ca- andMg hardness with a Ca-ISE electrode as two equivalence points (EQs) in one titration. But it isrecommended to use the more robust Cu-ISE for the determination of total hardness Appliances Titrator： TL 6000/TL7000/TL7750 Magnetic stirrer TM 235 20 mL exchange unit WA 20， incl. brown glass bottle for titrant GL 45 und S 40 bottle adapter Hoses and titration tip Drying tube Electrodes Reference electrode： B 2920+ Indicator electrode Cu 1100 A KabelL 1N Application Reagents Titrant： EDTA 0.1mol/l Ammonium chloride/ammonia buffer pH= 10 Copper-di-ammonia Titriplex@ solution Soda lime for CO2 absorption on the reagent bottle Description and Examples The term “water hardness” is a system with several mutually coupled chemical equilibra. The waterhardness is the one of the solubility equilibria between the different alkaline earth metal ionsassociated with the carbonate and sulphate precipitations (calcite， gypsum， e.g.) and the other fromthe solution and dissociation of carbon dioxide，carbon dioxide-cabonate system. e.g. The total hardness is the sum of the concentrations of the cations of alkaline earth metals (magnesiumand calcium ions) in water.Some additional ions such as iron are covered. Iron can interfere with thedetermination and is therefore masked with triethanolamine. These cations have a large， positivephysiological significance， however， interfere with some uses of the water. Thus forming e.g. thesecations introduced into the water insoluble calcium soaps， soap that have no more cleaning power. Preparation of ammonium chloride/ammonia buffer solution pH= 10 54 g Ammonium chloride for analysis are dissolved in 200 ml DI water. To this solution is added350 ml of 25% Ammonia solution“Analytical grade". Then it is filled up with DI water to 1 litre. Procedure In a 150 mL beaker， 100 mL of sample are measured accurately and mixed with 5 mL af ammoniumchloride/ ammonia buffer pH= 10. After addition of 1 mL of copper-di-ammonium Titriplex solution istitrated with 0.1 mol/l EDTA solution. Application Titration graph 2.50ml-195.3mV Mol (M)： 1.00000 Blank value (B)： 0.0000 ml Titre (T)： auto Factor 1 (F1)： 1000.0000 Pattern (V)： Vol Factor 2(F2)： 1.0000 The titration parameters are described under"Method” Calculation formula： Example： 2.613*0.10025*1000total hardness [mmol/]=2.613 100 Application Method： Method data overall view Method name： Hardness Created at： Method type： Automatic titration Last modification： Measured value： mV Titration mode： Dynamic Dynamic： Flat Measuring speed /drift： minimum holding time： 03s maximum holding time： 15 s measuring time： 02 s drift： Initial waiting time： Os Titration direction： Decrease Pretitration： End value： EQ： slope value： Flat Value： 120 Dosing parameter Dosing speed： 1 0 0 % spee Filling d：3 0 s Maximum dosing volume： 20.00 ml Unit values Unit size： 20ml Unit ID： 1296649042 Reagent： Na EDTA 0.1 m Batch ID： no Charge Concentration [mol/]： 0.10000 Determined at： 02/01/12 19：41：43 Expire date： Opened/compounded： Test according ISO 8655： Last modification： 02/01/1211：41：46 Application Hints If you have any questions on the application， you can feel free to contact us. JULABO TECHNOLOGY(Beijing)Co.，LTD 地址：北京市朝阳区酒仙桥东路1号院M8号楼C厅3层301室 Add ： Room 301，C hall，M8 office building，No.1 jiuxianqiao east road ，Chaoyang District，Beijing，China Tel.： 4008092068 昌Fax： +86 (0)10 64390585 ③Web： www.julabo.cn， www.julabo-visco.com 优莱博技术(北京)有限公司 of Date： Date： of