The determination of water hardness is performed by EDTA complexometric titration, in the presence of Eriochrome Black T (EBT) as a visual end point indicator. EBT is an azo dye that can be an environmental problem. Therefore, the present work investigated the possibility of using the solar ...
IMATO, T.; ISHII, K & ISHIBASHI, N. Flow-injection determination of the total water hardness by using a Copper(II) ion-selective electrode and a Copper(II) ion buffer. Anal. Sci., 8:631-635, 1992.Toshihiko IMATO,Kazuya ISHII,Nobuhiko ISHIBASHI.Toshihiko IMATO,Kazuya ISHII.Toshihiko IMA...
The proposed method overcame the deficiencies of the standard method. By measuring the total hardness in surface water, groundwater and standard samples using the standard method and the improved method, the results had no significant differences. Key words: EDTA titration total hardness water buffer...
Quantification of the uncertainty of the visual detection of the end-point of a titration: Determination of total hardness in water For most titrations based on the visual detection of the end-point this operation is an important uncertainty component. Well-known models are available to... D Fe...
Seston alkalinity is a term introduced with the purpose of considering the acid base neutral capacity of the particles integrating it. It can be determined by a simple method, based on a volumetric titration. In alkaline waters, this variable is associated with the insoluble forms of carbonates ...
This invention relates to cation-exchanging, water-insoluble aluminosilicates containing bound water and an ionic surface-active compound resistant to water hardness formers and having, for every mol of Al.sub.2 O.sub.3, from 0.7 to 1.5 ... E Reinwald,MJ Schwuger,H Smolka - US 被引量:...
Carboxylated nitrile butadiene rubber (XNBR) is a terpolymer composed of acrylonitrile, butadiene and monomers containing carboxyl groups, such as acrylic and methacrylic acids. Compared to NBR, it has improved physical properties, continuous higher service temperature, very good hardness/density balance,...
The carbon content influences not only the texture, but also the material properties of iron, such as magnetism, hardness or elasticity. For example, cast iron (2-4% C) is brittle but castable; tool steel (0.4-1,7% C) is elastic and ductile, carbon steel (<0.4% C) is forgeable and...
bindingcapabiIityofdissoIvedorganiccarbonfromnaturaIwaterwithcopperAnumberofmethodsavaiIabIefortitrationdatamanipuIation wereevaIuatedBasedonfinaIIossanddeterminativecoefficient,theparametersobtainedusingnonIinearestimation(Iog!=2.26,C=6.70 moI・g 1 )fittedtotheexperimentaIdatabest,whichwereaffectedbythe...
This methodology was applied to the determination of water total hardness by EDTA titration. The repeatability of the end-point detection was estimated by the difference between repeatability obtained from replicate titrations of the same solution and the combined repeatability of the measurements of ...