The determination of soil cation exchange capacity refers to the total amount of soil cation exchange capacity ( CEc refers to the various cations that can be adsorbed by soil colloid). Acidic and neutral soils are usually determined by the traditional ammonium acetate exchange method. The soil is repeatedly treated with ammonium acetate solution to make the soil saturated with ammonium ions; after washing off excess ammonium acetate with ethanol, the amount of ammonium ions is determined by distillation and converted into Soil cation exchange capacity.
Overview of detection methods:
Commonly used methods for the determination of soilcation exchange capacity include : acid and neutral soils use the acetic acid exchange method, and calcareoussoilscanuse the ammonium chloride -ammonium acetateexchange method. The advantages of acetic acid in measuring soil exchange capacity by exchange method are : when acetic acid interacts with base unsaturated soil, it releases weak acid. It will not damage the soil absorption complex, andthe buffering property ofammonium acetate is strong. The pH value is almost unchanged. When it is necessary to measure the composition of exchangeable cations in the solution, the excess acetic acid is easily decomposed by burning, so this method is widely used at home and abroad.
Jinan Shengtai Technology has developed this ST106K2 series of soils according to the current standards " LY/T 1243-1999 Determination of Cation Exchange Capacity in Forest Soils" and "NY/T295-1995 Determination of Cation Exchange Capacity and Exchangeable Bases in Neutral Soils" Cation exchange capacity detection combined instrument.
It can process 36 samples, and adopts the functions of automatic addition of reagents, automatic screw caps of the robotic arm, automatic addition of reagents, and automatic dumping of the supernatant; and a powerful shaking function is set to ensure that the soil samples are mixed evenly;
A multi-station centrifuge is used, and the centrifugation time and rotation speed of the centrifuge can be adjusted; the vibration part adopts multiple sets of rotating and mixing turntables, the rotation speed is adjustable, and the samples can be processed alternately;
ST106K2-2 Distillation Titration Module
According to the standard requirements, the instrument has a built-in water vapor generator, which can automatically heat the sample with water vapor;
It can heat and distill 6 samples at one time , and the heating zone can provide heating and heat preservation function;
The instrument can automatically set the distillation end point, automatically stop heating, and the receiving end is designed with a magnetic stirring function;
End-point identification uses a visual sensor higher than the human eye device, which can efficiently identify the titration end-point.
