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Determination method for trace amounts of dissolved oxygen in water

A technology of dissolved oxygen and testing methods, applied in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of long time, measurement interference, and complicated procedures, and achieve sensitivity High, simple method

Inactive Publication Date: 2013-09-11
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a defect in this method, that is, when the water contains nitrite, iron ions, and free chlorine, it will interfere with the determination
This method is a purely chemical detection method, which takes a long time and has cumbersome procedures, which cannot meet the requirements of on-site measurement.

Method used

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  • Determination method for trace amounts of dissolved oxygen in water
  • Determination method for trace amounts of dissolved oxygen in water
  • Determination method for trace amounts of dissolved oxygen in water

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0034] Embodiment 1: Determination of the preparation of the standard color scale of the water sample whose dissolved oxygen content is 0--70 micrograms per liter

[0035] a. Preparation of CoCl 2 Red solution: take 5.929 grams of cobalt chloride (CoCl 2 ·6H 2O), dissolved with 1% HCl and diluted to 100 mL with 1% HCl.

[0036] b. Preparation of CuSO 4 Blue solution: Take 6.245 grams of copper sulfate (CuSO 4 ·5H 2 O), dissolved with 1% HCl and diluted to 100 mL with 1% HCl.

[0037] c. Preparation of FeCl 3 Yellow solution: weigh theoretically 4.505 grams of ferric chloride (FeCl 3 ·6H 2 O), dissolved with 1% HCl and diluted to 100 mL with 1% HCl. FeCl 3 ·6H 2 O is very easy to deliquescence and cannot be weighed accurately. It can only be weighed and prepared approximately. 3 After the yellow solution is prepared, the FeCl in it must be measured before use. 3 ·6H 2 The actual content of O, the actual measured FeCl 3 ·6H 2 The O content is 85.46%.

[0038] d....

Embodiment 2

[0041] Embodiment 2: the mensuration of boiler feed water dissolved oxygen

[0042] According to the test principle, in a strongly alkaline medium, the yellow reduced indigo carmine sodium salt can be oxidized by dissolved oxygen in water to produce a colored substance. Its color depth is related to the amount of dissolved oxygen in water, and its color is from light greenish yellow, yellow, orange, red, crimson, purple, blue, and finally blue-green. Therefore, the content of dissolved oxygen can be measured according to the color change of the solution and compared with the standard color scale.

[0033] The present invention will be further described below in conjunction with specific examples, which are not limitations of the present invention.

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Abstract

The invention relates to a determination method for trace amounts of dissolved oxygen in water, and especially relates to a determination method for trace amounts of dissolved oxygen in boiler water. The method is used to solve problems of the prior art. The method, which is a novel visual colorimetry for dissolved oxygen, needs no expensive equipment, is easy to operate, and can be used to measure the trace amounts of dissolved oxygen in water. The method comprises the following steps: standard colors are prepared, wherein certain volumes of a CoCl2 red solution, a CuSO4 blue solution and a FeCl3 yellow solution are added into volumetric flasks marked with different numbers; 0.36ml concentrated hydrochloric acid is added into each volumetric flask; the solution in each volumetric flask is diluted to 100ml by deionized water; the solution of each volumetric flask is poured into one 100ml oxygen measuring bottle and the bottles are sealed for further applications; 0.3 to 0.5ml of an analytical reagent, i.e. alkaline reduced indicarmine, is added into the oxygen measuring bottles which is filled with water samples; the bottles is shaken to get the solution to be uniform, and colored substances are obtained; the color of the solutions in the oxygen measuring bottles is compared with the standard colors in 5min, and the oxygen content of the water samples is determined.

Description

technical field [0001] The invention relates to a method for testing dissolved oxygen concentration, in particular to a method for testing trace amounts of dissolved oxygen in boiler water. Background technique [0002] Dissolved oxygen content is an important indicator of water quality monitoring. For boiler feed water, under high temperature and high pressure, the dissolved oxygen in the water is very active, which will cause boiler corrosion. Moreover, the corrosion rate of boilers increases with the increase of dissolved oxygen content, so it is necessary to strictly control the dissolved oxygen content of boiler feed water. [0003] The determination methods of dissolved oxygen content mainly include: electrode method, fluorescence quenching method, iodometric method, gas chromatography, flow injection analysis method, etc. Among them, the electrode method is an electrochemical detection method, which is to measure the dissolved oxygen in the water sample. Reduction i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 文庆珍朱金华肖玲余超程清
Owner NAVAL UNIV OF ENG PLA