Digestion method and digestion apparatus of total phosphorus of water quality

Abstract

The invention discloses a digestion method and a digestion apparatus of total phosphorus of water quality. In the digestion method, the total phosphorus in a thin-layer water sample is subjected to combined digestion with a short-wave-length ultraviolet light being 254 nm in wave length and heat energy without addition of any oxidizing agent. The digestion apparatus is in a roll-type structure, wherein a high-transmittance ultraviolet light spiral quartz tube being 1 mm in internal diameter is employed as a digestion tube to form a thin-layer solution. A short-wave-length cold-cathode ultraviolet light tube being 254 nm in wave length is used as an ultraviolet light source and a flexible heating sheet is employed as a heating part, wherein the cold-cathode ultraviolet light tube is positioned at the center of the spiral digestion tube and the flexible heating sheet wraps the spiral digestion tube externally. The digestion method and a digestion apparatus simplify the digestion process of the total phosphorus, can achieve miniaturization, low power consumption and automation of a digestion device of total phosphorus, and provides a strong technical support for on-line monitoring the total phosphorus.

Description

technical field [0001] The invention relates to the technical field of water environment monitoring, and more specifically relates to a method and device for digesting total phosphorus in water, which can jointly digest total phosphorus by using short-wavelength ultraviolet light and heat without adding an oxidant. Background technique [0002] Total phosphorus refers to the sum of various forms of phosphorus in water, including elemental phosphorus, orthophosphate, condensed phosphate, pyrophosphate, metaphosphate and phosphate with organic groups. Exceeding the standard of total phosphorus in the water environment will bring serious harm to the environment and a serious threat to human health. Real-time monitoring of total phosphorus in the water environment is particularly important. [0003] The current national standard method detects total phosphorus, using potassium persulfate oxidative digestion method or nitric acid-perchloric acid oxidative digestion method, under ...

AI Technical Summary

Problems solved by technology

Both microwave and ultrasonic digestion require special high-power consumption equipment, which has the problems of large system volume and high power consumption

UV-assisted digestion usually requires the addition of ozone, H 2 o 2 Or strong oxidizing agents such as potassium persulfate increase the complexity of the digestion process, such as O 3 It is necessary to increase the ozone generator; at the same time, if the added strong oxidant is not completely decomposed during the digestion process, it will interfere with the subsequent detection

In addition, the traditional total phosphorus digestion method is not conducive to the miniaturization and low power consumption of the digestion device, and the on-site, online and automation of total phosphorus digestion are difficult

Images