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Method for quantifying urea and analyzing device

An analysis device and urea technology, which are applied in chemical method analysis, measurement device, and analysis using chemical indicators, etc., can solve problems such as the inability to measure urea concentration stably

Active Publication Date: 2019-11-15
ORGANO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the problem that the urea concentration cannot be measured stably over time

Method used

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  • Method for quantifying urea and analyzing device
  • Method for quantifying urea and analyzing device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035] figure 1 The device shown in is assembled. However, a portion from the line 20 to the flow meter FI is not provided so that the standard solution prepared to have a urea concentration of 60 ppb can be continuously supplied to the sampling valve 10 as sample water. Then, continuously monitor the urea concentration of the standard solution. Here, it was examined how the urea concentration obtained by the detector 32 as the measured value of the peak value of the detected absorbance varied when the standard solution was continuously measured. In this example, 2 g of diacetylmonoxime was dissolved in 100 mL of 10% acetic acid to prepare reagent A (i.e., an acetic acid solution of diacetylmonoxime), and 0.2 g of antipyrine was dissolved in 9 mol / L of sulfuric acid In, to prepare reagent B (that is, the reagent solution containing antipyrine) that the total amount is 100mL, those reagents after preparation are respectively stored in the storage tank 41,42, and each reagent ...

example 2

[0038] Reagent B was prepared as in the case of Example 1 and then stored at temperatures of 5°C, 10°C, 15°C, 20°C and 25°C for 10 days. Then, the reagent B stored in this way is supplied to figure 1 device shown. Immediately after supplying reagent B to the device, measure the standard solution with a urea concentration of 60 ppb to obtain its peak intensity. At this time, the peak intensity obtained when the standard solution was measured immediately after the reagent B was prepared was defined as 100%. Reagent A was prepared as in the case of Example 1, then stored and used at normal temperature. Table 1 shows the results.

[0039] [Table 1]

[0040] Reagent storage temperature (°C) Peak intensity (%) 5 98 10 99 15 89 20 80 25 72

[0041] As shown in Table 1, the peak intensity hardly decreased when the storage temperature was 5 °C and 10 °C, while it decreased by about 10% when stored at 15 °C. When stored at 20°C, the peak in...

example 3

[0043] The same experiment as Example 2 was performed except that Reagent A of Example 2 was stored at the same storage temperature as Reagent B of Example 2.

[0044] When reagent A and reagent B were refrigerated and then measured, results obtained were similar to those obtained when only reagent B was refrigerated and then measured (Table 1).

[0045] Figure List Marking

[0046] 10 Sampling valve

[0047] 11 Sample Loop

[0048] 31 Reaction coil

[0049] 32 detectors

[0050] 33 Back pressure coil

[0051] 40 refrigerator

[0052] 41, 42 storage tank

[0053] 43, 44 Mixer

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Abstract

Provided is a method for quantifying urea in a sample solution with a colorimetric method using diacetylmonoxime, wherein a reagent formulated for use in reaction is refrigerated, and the refrigeratedreagent is used to quantify urea. In particular, an antipyrine-containing reagent solution is maintained at, for example, 20 DEG C or lower after being formulated and until the solution is used to quantify the urea.

Description

technical field [0001] The invention relates to a method for quantifying urea in water and an analysis device. Background technique [0002] The precise quantification of trace amounts of urea in water is required. For example, when pure water is produced from raw water by a pure water production system, raw water from which urea has been removed in advance must be supplied to the pure water production system because it is difficult to remove urea in the raw water by ion exchangers and ultraviolet oxidizing agents constituting the pure water production system. As a urea removal method, there is known a method of selectively oxidizing urea with hypobromous acid by adding a chemical reagent for generating hypobromous acid to raw water. However, the chemical reagents used to generate hypobromous acid are also the load of the pure water production system, so the smaller the input amount of chemical reagents, the better. Therefore, it is desirable to determine the necessity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/18G01N31/00G01N31/22
CPCG01N31/00G01N31/22G01N33/18
Inventor 高桥一重菅原广须藤史生岛田胜久
Owner ORGANO CORP
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