Chromium measurement reagent and method
A measurement method and reagent technology, applied in the direction of color/spectral characteristic measurement, analysis through chemical reaction of materials, etc., can solve problems such as inability to obtain sensitivity and decrease in sensitivity
Active Publication Date: 2014-01-29
东亚DKK株式会社
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Problems solved by technology
Especially when the diphenylcarbazide solution is stored in a high temperature environment, the sensitivity drops significantly
Therefore, if it is used for a long time in an automatic analyzer, etc., there may be a problem that the required sensitivity cannot be obtained.
Method used
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Embodiment
[0058] The following shows examples of experiments conducted to clarify the effects of the present invention. Furthermore, the Cr used in the following experimental examples 6＋ The 1mg / L standard solution is the Cr1000 chromium standard solution produced by Kanto Chemical (including Cr 6＋ 0.01mol / L nitric acid solution of potassium dichromate with a concentration of 1000mg / L) diluted 1000 times with water.
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The invention provides a chromium measurement reagent, which can sufficiently inhibit decline of sensitivity along with time, and simultaneously provides a chromium measurement reagent with high intitial sensitivity. The chromium measurement reagent contains solvent and the solvent contains diphenylcarbazide and hydroxylamine hydrochloride. One chromium measurement method is used for reaction of the sample liquid and the chromium measurement reagent under acid condition, thereby measuring the absorbance.
Description
technical field [0001] The invention relates to a chromium determination reagent and a chromium determination method. More specifically, it relates to a chromium measurement reagent and a chromium measurement method suitable for use in an automatic chromium analyzer in water. Background technique [0002] It is known that hexavalent chromium reacts with diphenylcarbazide under acidic conditions to form a purple-red complex. For example, JIS K0102 specifies the diphenylcarbazide absorptiometry method for the measurement of chromium (hexavalent chromium, total chromium). This diphenylcarbazide solution is oxidized by dissolved oxygen dissolved in the solvent over time, and the color development intensity (sensitivity) when reacting with hexavalent chromium decreases. In particular, when the diphenylcarbazide solution is stored in a high-temperature environment, the sensitivity drops significantly. Therefore, if it is used for a long time in an automatic analyzer or the like...
Claims
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Inventor 渡边昌之
Owner 东亚DKK株式会社
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