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Method for automatic online detection of total chromium in water

An automatic monitoring and pump-in-pipe technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problem that excessive oxidants are difficult to remove completely, total chromium is difficult to achieve, and the impact of Test results and other problems, to achieve good test results, easy to operate, eliminate the effect of the effect

Inactive Publication Date: 2012-12-26
UNIVERSTAR SCI & TECH SHENZHEN
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Problems solved by technology

The operation process of this method is cumbersome and the excess oxidant is not easy to remove thoroughly, which will affect the measurement results after the solution fades after color development.
It is even more difficult for the online monitor to accurately test the total chromium in the water sample by this method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] Take 5 water samples at different time periods at the total outlet of an electroplating factory, each sample is divided into two parts, and pretreated according to the pretreatment method of GB / T 7466-1987, respectively using the method of the present invention and the laboratory Manually test the total chromium concentration according to the method of GB / T7466-1987, and the results are shown in the table below.

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Abstract

The invention relates to a monitoring method for total chromium and discloses a method for automatic online monitoring of total chromium in water. The method comprises the following steps: firstly, sampling: firstly, pumping 5ml of sample liquid into a chromoscope of an instrument through a liquid pump; secondly, adding a reagent: respectively pumping 0.5ml of sulfuric acid and 0.5ml of phosphoric acid with the volume ratio being 1:1 respectively into the chromoscope of the instrument; then adding 2.5ml of oxidant and 0.2 percent potassium permanganate; heating a mixed solution at the temperature of 100DEG C for 10 minutes; and then cooling the mixed liquid to room temperature; thirdly, developing: adding 5ml diphenylcarbazide as a developing agent for developing reaction and setting the developing time as 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes and 30 minutes respectively; and fourthly, analyzing: accumulating the results of the third step, averaging and storing the result into the instrument or transmitting the result to a server. The method disclosed by the invention has the advantage of accurately measuring the total chromium in a water sample by using an online monitor.

Description

technical field [0001] The invention relates to a monitoring method for total chromium in water, in particular to a method for on-line automatic monitoring of total chromium in water which can accurately test total chromium in water samples by using an online monitor. Background technique [0002] The determination of total chromium in the water sample by the current colorimetric method is to use diphenylcarbazide as the color reagent, and potassium permanganate or potassium persulfate as the oxidizing agent (hereinafter collectively referred to as the oxidizing agent) to measure. In the acidic solution, the trivalent chromium in the water sample is oxidized by the oxidant to generate hexavalent chromium, and the hexavalent chromium reacts with diphenylcarbohydrazide (DPC) to form a purple compound, and then the total chromium is determined colorimetrically. Excess oxidant is reduced with sodium nitrite, and excess sodium nitrite is decomposed by urea. The operation process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 陆建华余烨
Owner UNIVERSTAR SCI & TECH SHENZHEN
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