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What should be paid attention to when using the COD rapid analyzer? The COD rapid analyzer is composed of a dedicated COD host and a digester, with functions such as automatic temperature control, timing, zero adjustment, linear regression, curve storage and data printing
.
Generally, open-tube reflux heating digestion or sealed digestion method is used
.
When using the COD rapid analyzer, you need to pay attention to some related matters: 1.
The wall thickness of the new digestion tube is uneven, and it should be screened before use
.
Take a batch of digestion tubes, add 5 mL of 0.
025mol/L potassium dichromate solution for digestion and determination, and select digestion tubes with COD measurement value ≤3mg/L
.
In addition, the digestion tube has directionality during colorimetric measurement, and cannot be placed in the wrong direction
.
2.
In order to improve the detection performance of the COD analyzer, the mutual influence of the samples during the detection should be minimized, and the colorimetric cell should be washed with distilled water and the sample to be tested in turn before each sample
.
In addition, the reaction tube of the blank, standard sample, sample and the cover used for the reaction tube can be used separately as much as possible to reduce the deviation caused by the operation
.
3.
The sample digestion process needs to be carried out in a ventilated place, and the acidity of the solution is relatively high
.
4.
In the standard series, if a very small amount of precipitate (mercury sulfate) is precipitated at the bottom of the special colorimetric tube after digestion and cooling, it will have no effect on the measurement result
.
5.
If the color of the solution is uneven after all the reagents are added, it should be fully cooled and shaken, and then digested
.
6.
Before colorimetric measurement, it must be warmed up for 30 minutes before measurement
.
7.
Special colorimetric tubes, pipettes, measuring cylinders, beakers and other glassware used in the whole measurement process should be cleaned before use, so as not to affect the measurement results
.
8.
For water samples with COD mass concentration <50mg/L, use low-concentration digestion solution for digestion, and take parallel double samples for measurement to reduce measurement errors
.
9.
The blank sample has a great influence on the test results, and the blank sample should be measured in parallel
.
The above is the relevant introduction about the key points of using the COD rapid analyzer.
I believe that everyone has a corresponding understanding of this after reading it.
You can use it as a reference and hope it will be helpful to you
.
.
Generally, open-tube reflux heating digestion or sealed digestion method is used
.
When using the COD rapid analyzer, you need to pay attention to some related matters: 1.
The wall thickness of the new digestion tube is uneven, and it should be screened before use
.
Take a batch of digestion tubes, add 5 mL of 0.
025mol/L potassium dichromate solution for digestion and determination, and select digestion tubes with COD measurement value ≤3mg/L
.
In addition, the digestion tube has directionality during colorimetric measurement, and cannot be placed in the wrong direction
.
2.
In order to improve the detection performance of the COD analyzer, the mutual influence of the samples during the detection should be minimized, and the colorimetric cell should be washed with distilled water and the sample to be tested in turn before each sample
.
In addition, the reaction tube of the blank, standard sample, sample and the cover used for the reaction tube can be used separately as much as possible to reduce the deviation caused by the operation
.
3.
The sample digestion process needs to be carried out in a ventilated place, and the acidity of the solution is relatively high
.
4.
In the standard series, if a very small amount of precipitate (mercury sulfate) is precipitated at the bottom of the special colorimetric tube after digestion and cooling, it will have no effect on the measurement result
.
5.
If the color of the solution is uneven after all the reagents are added, it should be fully cooled and shaken, and then digested
.
6.
Before colorimetric measurement, it must be warmed up for 30 minutes before measurement
.
7.
Special colorimetric tubes, pipettes, measuring cylinders, beakers and other glassware used in the whole measurement process should be cleaned before use, so as not to affect the measurement results
.
8.
For water samples with COD mass concentration <50mg/L, use low-concentration digestion solution for digestion, and take parallel double samples for measurement to reduce measurement errors
.
9.
The blank sample has a great influence on the test results, and the blank sample should be measured in parallel
.
The above is the relevant introduction about the key points of using the COD rapid analyzer.
I believe that everyone has a corresponding understanding of this after reading it.
You can use it as a reference and hope it will be helpful to you
.
