Chemiluminescence system and method for measuring dissolved oxygen

Abstract

The invention relates to a chemiluminescence system and a method for measuring the dissolved oxygen in water. The chemiluminescence system comprises solution A and solution B; the solution A is a luminescence reagent which contains 1.0 multiplying 10-4 to 1.0 multiplying 10 -3 mol / L of Luminol, 0.10-0.50 mol / L of CO32-, and 0.02-0.10 mol / L of HCO3-; the solution B is the liquid under test obtained after the treatment of water sample through dissolved oxygen fixing and free iodine steps in the measuring process with iodometry of dissolved oxygen. The main measuring steps are as follows: the blank solution, the standard solution and the test solution B are mixed and reacted with the solution A in a reaction detection container of a chemiluminescence apparatus, based on a volume ratio of 1 to 0.8-1.2, and the luminous intensity is detected so as to obtain the dissolved oxygen content in the corresponding sample. The invention combines the chemiluminescence with the iodometry so as to take advantages of high sensitivity and low detection limit of the chemiluminescence and avoid the problems of inaccurate endpoint determination, as well as complicated sodium thiosulfate configuration and calibration of the iodometry; besides, the invention has small reagent consumption, low cost, as well as accurate and reliable measurement result, and is suitable for the analysis and measurement of dissolved oxygen for most water bodies.

Description

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AI Technical Summary

Benefits of technology

This technology uses chemical light emission from lamps or other sources that emit visible lights when excited by an electric current flow through them. It can detect very tiny amounts of gas molecules like nitrogen dioxide at levels below 5 ppb without being affected by factors such as temperature changes or humidity. These techniques have advantages over traditional methods because they provide more sensitive measurements while reducing costs compared to older technologies.

Problems solved by technology

This patented technical problem addressed in this patent relates to accurately detecting DO levels in water sampleings due to its challenges with traditional methods like ion exchange or colorimetric analysis techniques that require complicated instrumentations and are time consuming processes. Chemiluminisers provide another option called chemical luminosity, where they create light when exposed to certain substances found naturally occurring therein. However these existing ways still suffer from issues including lack precision, instability during operation, difficulty adjustment, and potential contaminants affecting their effectiveness.

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