Class / Patent application number | Description | Number of patent applications / Date published |
436083000 | Ti, Zr, Hf, Va, Nb, Ta, Cr, Mo, W | 7 |
20090286323 | DETERMINATION METHOD AND INSTRUMENTS OF HEXAVALENT CHROMIUM - It is an object of the present invention to provide an analytical method and analyzer for hexavalent chrome that allows for measuring hexavalent chrome conveniently without using a spectrophotometer and obtaining the objective quantification results. Disclosed herein is an analytical method for quantifying hexavalent chrome by, after adding a reagent for complex formation to a liquid sample to form a colored chelate of hexavalent chrome, then contacting the liquid sample with an adsorbent, and measuring a thickness of a colored layer of the adsorbent. | 11-19-2009 |
20110008898 | Method for Simply Quantitatively Determining Hexavalent Chromium Technical Field - Provided is a method for simply quantitatively determining hexavalent chromium, including: separately bringing a plurality of test solutions into contact with a sample, the plurality of test solutions each containing a color change agent which changes in color upon reaction with hexavalent chromium, and an acid which dissolves the sample, the plurality of test solutions having different contents of the acid from each other; detecting color change in each of the test solutions; and when the color change is detected, specifying a range of content of hexavalent chromium in the sample on the basis of the content of the acid in a test solution with the color changed among the plurality of test solutions. | 01-13-2011 |
20110059536 | HEXAVALENT CHROMIUM DETECTOR - The present invention relates to a molecular-based system for the optical detection, quantification and detoxification of hexavalent chromium (Cr | 03-10-2011 |
20110143442 | METHOD FOR DETECTING THE PRESENCE OR ABSENCE OF A CHEMICAL SUBSTANCE IN A LIQUID MEDIUM - The invention pertains to a method for determining the presence or absence of at least one chemical substance in a liquid medium, comprising a contacting step of said liquid medium with a device comprising at least one substrate coated, in whole or in part on at least one of its sides, with at least one layer comprising material able to be degraded fully or partly by said chemical substance, said material being chosen from among metals, metal alloys, metal oxides. | 06-16-2011 |
20110300634 | Method for Determining Chromium Content in a Tungsten Matrix with Added Chromium or Simultaneously Added Chromium and Vanadium - A method for determining chromium content in a tungsten matrix with singly or simultaneously added chromium and vanadium, characterized in that a test sample is subjected to melting with sodium peroxide and hot water leaching; meanwhile said sodium peroxide is also used as an oxidizing agent to oxidize all the chromium to high valences; the main body of tungsten is coordinated by ammonium hydrogen fluoride to prevent tungstic acid from precipitating; precipitation and turbidity are avoided throughout the analysis, titration can be carried out in a quite clear condition with accurate and reliable results. In this invention, the clearness of the solution when titrating is very important for the accuracy of titrimetric analysis; the solution is always clear throughout the determination, ensuring that the interference with determination of chromium from vanadium is accurately and quantitatively eliminated; the interference from vanadium is eliminated by subtraction method, by means of titrating with ferrous ammonium sulfate standard solution after oxidation with potassium permanganate. In this invention, the determination method allows the determination to be carried out in the quite clear condition, and eliminates the interference from vanadium completely and quantitatively, thus the accuracy and speed of the determination of chromium content in a tungsten matrix with singly or simultaneously added chromium and vanadium are improved. | 12-08-2011 |
20110318841 | Method for Determining Vanadium Content in a Tungsten Matrix with Added Vanadium or Simultaneously Added Chromium and Vanadium - A method for determining vanadium content in a tungsten matrix with singly added vanadium or simultaneously added chromium and vanadium, characterized in that a test sample is subjected to alkaline melting with sodium peroxide and water leaching followed by dry filtering, the chromium and vanadium in the filtrate are firstly reduced to low valences by a reducing agent, i.e. hydroxylamine hydrochloride, then the filtrate is adjusted to an acidity of 4-6 M with nitric acid, the vanadium is oxidized in a cold state to a high valence by potassium permanganate, and the high-valent vanadium forms a ternary complex with tungstate and orthophosphate, the darkness of the color of the ternary complex is directly proportional to the vanadium content, thus the vanadium content is determined colorimetrically, and the interference of chromium is eliminated with the fact that the potassium permanganate in a cold state in the acidic condition for vanadium determination oxidizes the vanadium but not the chromium. The method of the invention is relatively suitable for determining the macro-amount vanadium content in a tungsten matrix containing macro-amount vanadium singly or containing macro-amount vanadium and chromium simultaneously, the method is fast and accurate with a relative error less than 5%, which can fully satisfy the requirements of the production process for the determination. | 12-29-2011 |
20130052743 | FLOWABLE DRY POWDER COMPOSITION - A flowable dry powder composition comprising a mixture of diphenylcarbazide particles and glass bubbles; kits containing such compositions; methods of filling containers with such compositions; and, methods of using such compositions in the detecting of hexavalent chromium. | 02-28-2013 |
Patent applications in class Ti, Zr, Hf, Va, Nb, Ta, Cr, Mo, W