Small-size sequential injection nitride analysis system

Abstract

The invention relates to a small-size sequential injection nitride analysis system. A first electromagnetic valve is connected with a nitride standard solution; a second electromagnetic valve is connected with a development agent and deionized water; the first electromagnetic valve and the second electromagnetic valve are both connected to a third electromagnetic valve; the third electromagnetic valve is also connected to a fourth electromagnetic valve connected with a water sample; a fifth electromagnetic valve is connected with the deionized water and a waste liquid bottle with a liquid level detection device; a fourth electromagnetic valve and a fifth electromagnetic valve are respectively connected to a six-way valve through a first peristaltic pump and a second peristaltic pump; the six-way valve is connected with waste liquid, a quantifying ring and a colorimetric match pool respectively. On the basis of theories of an improved sequential injection analysis method and a spectrophotometric method, the system has the advantages of simple structure, simplicity in operation, quantification precision, high stability, high reproducibility, high precision, low detection limit and the like; and in actual application, the system is portable and can perform full-automatic real-time on-line monitoring.

Description

Technical field [0001] The invention relates to an analysis system for nitrite in environmental water samples, in particular to a small sequential injection nitrite analysis system. Background technique [0002] Nitrite is widely found in soil, natural water and food. It can interact with amines and phthalamide compounds in the human body to produce carcinogenic nitrosamine compounds. The potential toxicity caused by nitrite has caused People's great concern, so it is an important indicator of water quality monitoring and food monitoring. [0003] At present, there are many detection methods for nitrous acid content, mainly including spectrophotometry, fluorescence method, ion chromatography, polarography, high performance liquid chromatography, catalytic spectrophotometry, etc. Some of these methods have high sensitivity and good selectivity. However, expensive instruments and reagents have greatly restricted the scope of application; some instruments are large in size and inconv...

AI Technical Summary

Problems solved by technology

However, at present, manual detection is mostly used in spectrophotometry, and the detection accuracy is difficult to improve, and it is not suitable for online automatic detection of water quality.

[0004] Sequential injection analysis (SIA) is the second-generation flow injection analysis system. Its main components are multi-channel selection valves and syringe pumps, and they need to be equipped with high-precision stepping motors, resulting in expensive instruments and poor component selection.

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