Combined investigating analysing method of sediment total nitrogen and phosphorus

Abstract

The invention discloses a method for determining total nitrogen and total phosphor in deposits and soil, firstly drying, crushing, screening and thoroughly mixing uniformly the fresh sample collected, and weighing a certain amount and placing in a digesting container and serving; adding digestant in the digesting container and mixing them uniformly; stopping closely with ground stopper, wrapping with gauze and placing in high pressure steam boiler and making high temperature digestion and cooling and taking out; absorbing digesting supernatant and scanning at 190nm-290nm wavelengths to determine the optimum absorption wavelength and background value; measuring light absorption value and obtaining total nitrogen; absorbing digesting supernatant, adding in color developing agent and developing color at constant volume, scanning at 650-750nm wavelengths, determining the optimum absorption wavelength, determining light absorption degree and obtaining total phosphor. And the method is especially applied to combined determination of total nitrogen and total phosphor of deposits and soils in rivers, lakes, reservoirs, seas, etc.

Description

1. Technical field

[0001] The invention relates to a technical method for the determination of total nitrogen and total phosphorus in sediments and soils. Specifically, samples are combined and digested at one time, the best absorption peak is determined by wavelength scanning, and the background value is deducted to quickly and accurately measure total nitrogen and total Phosphorus method. 2. Background technology

[0002] Many research data show that the content of total nitrogen and total phosphorus is positively correlated with the degree of eutrophication of lakes. Lake sediments are a collection of pollutants in the water environment, and most of the pollutants entering the lake water are deposited in the lake bottom mud. Therefore, lake sediments are archive records of watershed environmental changes and human impacts on the environment. Sediments reconstruct the lake's pollution history. At the same time, the nutrient salt in the sediment is also the internal load ...

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