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Instrument measuring method for total nitrogen in coking wastewater

A technology of coking wastewater and a determination method, which is applied in the field of analysis and determination of chemical substances, can solve problems such as complicated operation steps, and achieve the effect of simple operation.

Active Publication Date: 2013-04-24
宝钢化工湛江有限公司
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Problems solved by technology

The commonly used determination method is potassium persulfate oxidation-ultraviolet spectrophotometry. The determination principle is: under high temperature and high pressure, potassium persulfate is used as an oxidant to oxidize ammonia nitrogen and nitrite nitrogen in water and most of the organic nitrogen compounds are nitrates. Then use ultraviolet spectrophotometry to measure the content of total nitrogen. The problem with this method is that the operation steps are complicated and take about 4 hours.

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  • Instrument measuring method for total nitrogen in coking wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] 《Example 1》Determination of total nitrogen concentration in external drainage

[0050] The standard curve used in the measurement of external drainage is made of potassium nitrate, that is, the second standard curve is used, and the total nitrogen concentration range of the second standard curve is controlled within 20-200 mg / L. Samples were measured twice in succession (5 minutes each). If the variation constant of the two measurement results compared with each other is less than the maximum variation constant limit, the entire measurement process will end, and the average of the two measurement results will be taken as the total nitrogen concentration; if the variation constant of the two measurement results is greater than the maximum variation constant The computer automatically carries out the third determination, and after comparing the determination results, the average value of the results of the two variation constants less than the maximum variation constant l...

Embodiment 2

[0051] 《Example 2》Determination of total nitrogen concentration in sedimentation tank water

[0052] The measurement process of the instrument is the same as that of external drainage. The composition of total nitrogen in sedimentation tank water is the same as that of external drainage. The standard curve is made of potassium nitrate (the second standard curve). The total nitrogen concentration of the second standard curve ranges from 50 to 300 mg / L.

Embodiment 3

[0053] Example 3: Determination of Adjustment of Tank Water

[0054] The measurement process of the instrument is the same as that of external drainage. Since the composition of total nitrogen in the adjustment tank is different from that of external drainage and sedimentation tanks, the standard curve is made of ammonium sulfate, that is, the first standard curve is used. The total nitrogen concentration of the first standard curve ranges from 50 to 300 mg / L.

[0055] The principle of choosing the first standard curve or the second standard curve is based on the main composition of total nitrogen in the sample.

[0056] Different standard curves are used in the determination of different coking wastewater samples, which solves the error caused by the instrument method.

[0057] The determination method of the present invention is compared with the potassium persulfate oxidation-ultraviolet spectrophotometry of the national standard, and the measurement results are basically ...

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Abstract

The invention discloses an instrument measuring method for total nitrogen in coking wastewater, which relates to an analytic measuring method for chemical substances, and solves the problems of operation complication and time waste of total nitrogen measurement of an existing potassium persulfate oxygenation-ultraviolet spectrophotometric method. The measuring method provided by the invention utilizes a TOC (total organic carbon) analyzer to measure the total nitrogen in the coking wastewater, and comprises the steps that: a standard solution is firstly prepared and a standard curve of the standard solution is established, the total nitrogen and an ozone gas source in a sample are combined and then resolved into nitrogen monoxide after the sample is combusted, the nitrogen monoxide gas is driven by carrier gas to enter into a chemiluminescence detector to be detected, and then the total nitrogen concentration in the sample is measured by comparing a detecting signal sent from the detector with the standard curve. Compared with the potassium persulfate oxygenation-ultraviolet spectrophotometric method, the measuring method provided by the invention has the obvious advantages that the operation is simple, and the consuming time is only about 15 minutes.

Description

technical field [0001] The invention relates to a method for analyzing and measuring chemical substances, in particular to an instrument method for measuring total nitrogen in coking wastewater. Background technique [0002] With the improvement of environmental protection requirements, total nitrogen will also be included in the drainage control indicators. The total nitrogen content of coking wastewater is relatively high. During the degradation process, it is necessary to detect the total nitrogen of the wastewater in each treatment stage. The commonly used determination method is potassium persulfate oxidation-ultraviolet spectrophotometry. The determination principle is: under high temperature and high pressure, potassium persulfate is used as an oxidant to oxidize ammonia nitrogen and nitrite nitrogen in water and most of the organic nitrogen compounds are nitrates. Then use ultraviolet spectrophotometry to measure the content of total nitrogen. The problem of this me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76
Inventor 陆东跃徐静娟蒋月红
Owner 宝钢化工湛江有限公司
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