Method for measuring the pH value of soil solution - Database & Sql Blog Articles

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How to measure soil pH is a frequently debated issue. In general, there are three options:

1. The pH value of the fine mud paste: a sufficient amount of distilled water is added to the soil sample to form a very fine paste, which is placed for 5 minutes to be inserted, and the instrument value is read after 15 to 20 seconds. Note that the electrode should be adequately washed between measurements.

2, soil and water 1:1 suspension pH: 20 grams of soil sample in a 50 ml beaker, add 20 ml of distilled water, stir the suspension several times, each interval of about 1 hour, stop stirring immediately after immersion in pH compound The electrode measures the pH.

3. Water-saturated soil paste pH: Add a small amount of distilled water to the soil sample, stir the water-saturated soil paste with a spatula, make it uniform, and then gently beat the paste in a special vessel. Until the paste can reflect light and flow slightly. The paste should be able to slide freely when the utensil is turned over, and if it is adhered, it can be scraped off with a scraper. The paste was allowed to stand for more than 1 hour, and the degree of water saturation of the sample was checked again (according to the above method). During the placement process, there should be no free moisture on the surface of the sample. The paste should not be hardened or tarnished. If the sample becomes hard or tarnished, add water and remix. If the paste is too moist, add some. Dry soil. After sample preparation, the electrodes are inserted into the paste to raise or lower the position of the electrode until a reproducible pH reading is obtained.

The above three methods can give reproducible results, but the data obtained by different methods for the same sample are slightly different, so the method used should be indicated when reporting soil pH.

Ordinary pH composite electrode When the pH value of the soil solution is measured by the above method, the charged micelle or the particle easily causes the glass electrode liquid junction potential to be unstable. In order to solve this problem, the company has introduced a special electrode for the soil solution. S3221 glass pH composite electrode adopts glass grinding liquid junction structure, which greatly improves the exudation rate of external reference solution, can reduce the influence of micelles or particles on the liquid junction potential, and is used with Aileus pH410 or pH510 host. Ensure that the measurement results are accurate and reliable.

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