Preface:

The determination of soil cation exchange capacity (CEC) refers to the total amount of exchangeable cations (CEc refers to the various cations that soil colloids can adsorb). For acidic and neutral soils, the traditional barium acetate exchange method is commonly used, where the soil is repeatedly treated with barium acetate solution to saturate it with barium ions; excess barium acetate is then removed with ethanol,and the amount of barium ions is determined by distillation and converted to soil cation exchange capacity.

Overview of Detection Methods:

Soilcation exchange capacity is commonly measured using methods such as:acidic and neutral soils are tested using the barium acetate exchange method, while calcareoussoilscanbe treated with calcium chloride-barium acetateexchange method. The advantages of the barium acetate exchange method for determining soil exchange capacity are:when barium acetate interacts with salt-unsaturated soils, it releases weak acids without damaging soil absorption complexes,barium acetatehas strong buffering properties, and the pH of the resulting solution remains almost unchanged. When determining the composition of exchangeable cations in the solution, excess barium acetate is easily decomposed by combustion, making this method widely used both domestically and internationally.

Based on current standardsLY/T 1243-1999 , , Jinan Shengtai Technology developed the ST106K2 series soil cation exchange capacity detection instrument.

ST106K2-1 Solid-Liquid Separation Module (Centrifuge Shaker)

Can process36 samples, featuring automatic reagent addition, mechanical arm auto-capping, automatic reagent addition, and automatic supernatant pouring functions; equipped with strong vibration mixing to ensure uniform soil sample mixing;

Uses a multi-position centrifuge with adjustable centrifugation time and speed; the shaking part adopts multi-group rotary mixing discs with adjustable speed, enabling alternating processing of samples;

ST106K2-2 Distillation Titration Module

According to standard requirements, the instrument includes a steam generator for automatic steam heating of samples;

Can heat and distill6 samples at once, with the heating zone providing temperature maintenance;

The instrument can automatically set the distillation endpoint, stop heating, and features magnetic stirring at the receiving end;

Endpoint recognition uses high-precision visual sensors for efficient titration endpoint detection.

Jinan Shengtai Technology ST106K2 Series Soil Cation Exchange Capacity Detection Instrument Demonstration Video: