Preparation method for reagents D and E of fast COD(Chemical Oxygen Demand) determinator

A preparation method and rapid determination technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of high cost, passive work, etc., and achieve the effect of reducing costs

Inactive Publication Date: 2013-09-04
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD +1
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Problems solved by technology

Compared with the national standard method (standard number GB111914-89 Determination of chemical oxygen demand in water by dichromate method), this method has the advantages of simple operation, high accuracy, and saving reagents and time. It is a secret formula of the manufacturer, and it must be ordered from it when using it. The cost is high and it is easy to cause passive work

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  • Preparation method for reagents D and E of fast COD(Chemical Oxygen Demand) determinator
  • Preparation method for reagents D and E of fast COD(Chemical Oxygen Demand) determinator

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Effect test

Embodiment 1

[0015] Embodiment 1: the preparation of D, E reagent of the present invention

[0016] 1. Preparation of reagent D: potassium dichromate-mercuric sulfate solution

[0017] 1) Dry potassium dichromate (premium grade) at 118-122°C to constant weight, weigh 24.515g of potassium dichromate and put it in a beaker, add 600mL of distilled water, slowly add 100mL under stirring (1+9) In sulfuric acid solution, after dissolving and cooling, transfer to a 1000mL volumetric flask and distilled water to obtain solution A; the concentration of potassium dichromate in solution A is C (K 2 Cr 2 o 7 ) = 0.0834 mol / L, C (1 / 6K 2 Cr 2 o 7 ) = 0.500 mol / L.

[0018] 2) Weigh 50g of mercuric sulfate (analytical pure) into a beaker, add 1000mL (1+9) sulfuric acid solution and stir to dissolve to prepare solutions B, C (HgSO 4 ) = 50g / L;

[0019] 3) Mix the solution A and the solution B at a ratio of 7:10 to prepare D reagent. D reagent solution can be stored stably for 6 months.

[0020] T...

Embodiment 2

[0023] Embodiment 2: measure the COD of different concentration standard solution with D, E reagent prepared by the present invention, the test instrument is Lanzhou Lianhua Environmental Protection Technology Co., Ltd. 5B-3C type COD rapid tester

[0024] 1. Draw 2.5mL COD standard solution standard sample according to the instrument usage method, add 1.7mL D reagent and 4.8mL E reagent, after digestion and cooling, add 1.5mL of distilled water, shake well and measure the result, draw the 5B-3C COD rapid detector working curve.

[0025] 2. Determine the COD of standard solutions with different concentrations according to the above method.

[0026] 3. Test results and data processing

[0027] Table 1 Accuracy and precision test of measured values ​​of standard samples (unit: mg / L)

[0028]

[0029] As can be seen from Table 1, the relative errors of measuring COD values ​​of 51.9mg / L, 132mg / L, 204mg / L, and 511mg / L COD standard solutions in parallel six times with self-pre...

Embodiment 3

[0030] Embodiment 3: respectively use the D, E reagent of Lianhua Technology Company and the self-prepared D, E reagent of the present invention to measure the COD value of the wastewater in three different places of our company, and the test results are shown in Table 2. The test instrument is the 5B-3C COD rapid detector of Lanzhou Lianhua Environmental Protection Technology Co., Ltd.

[0031] Table 2 Contrast test of using Lianhua Technology's D, E reagents and self-prepared D, E reagents to measure COD (unit: mg / L)

[0032]

[0033] It can be seen from Table 2 that the three wastewater samples were measured at the same time with self-prepared reagents and outsourced factory reagents. %, 0.46%~1.67%. According to the introduction in "Determination of Chemical Oxygen Demand-Dichromate Method GB11914-89", the indoor relative standard deviation of industrial wastewater determination is 0.7%~3.0%. It can be seen that the precision and accuracy of the self-prepared D and E ...

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Abstract

The invention discloses a preparation method for reagents D and E of a fast COD (Chemical Oxygen Demand) determinator, including preparation of the reagents D and reagent E, wherein the reagent D is a potassium dichromate-mercury sulfate solution, and the reagent E is a sulfuric acid-silver sulfate solution. The prepared reagents D and E are applicable to a 5B-3C type fast COD determinator and a 5B-1 intelligent type multifunctional digester of Lian-hua Tech.Co.,Ltd, and can also be used for COD determinators with the same determination principle in other manufacturers. The prepared reagents D and E can both achieve requirements of national standards on determining the accuracy of COD, and can replace the outsourcing reagents D and E for COD determination.

Description

1. Technical field [0001] The invention relates to the preparation of a COD measuring medicament, in particular to a preparation method of D and E reagents of a rapid COD measuring instrument. 2. Background technology [0002] At present, the rapid COD detector of Lanzhou Lianhua Environmental Protection Technology Co., Ltd. (hereinafter referred to as Lianhua Technology) is gradually popularized in the application of COD determination, and it is also the main method for measuring COD in our company's sewage treatment station, central laboratory, and VAE emulsion factory. Compared with the national standard method (standard number GB111914-89 Determination of chemical oxygen demand in water by dichromate method), this method has the advantages of simple operation, high accuracy, and saving reagents and time. It is a secret formula of the manufacturer, and it must be ordered from it when using it. The cost is high and it is easy to cause passive work. 3. Contents of the inv...

Claims

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Application Information

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IPC IPC(8): G01N21/25
Inventor 汪成美牙金艳林海峰卢杰孙先武石显伟韦丽双罗丽石水荣陶应杨
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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