Before using the soil composition analyzer to detect soil nutrients, nutrient test liquids need to be prepared. The preparation process is as follows: When using a soil composition analyzer, note the following: Ruian LIAN Auto Parts Co.,LTD , https://www.lian-autoparts.com
Weigh 2.0 g of air-dried soil samples or 2.0 (1+ moisture) grams of fresh soil samples, and place them in soil extraction bottles (conical bottles or plastic bottles), and use a pipette to extract 40 ml of northern soil extractant to the extraction bottle. Medium (when using southern extracts, 5.0 g of air-dried soil samples or 5.0 (1+ water content) grams of fresh soil samples are placed in a soil extraction bottle (either in a flask or a plastic bottle) and the soil is sucked with a pipette. 25ml of extracting agent in the extraction bottle), and then take a spoonful of soil decoloring agent (about 0.5g) into the extraction bottle, keep the temperature between 20-25°C, shake vigorously for 5 minutes (recommended 220 The oscillating oscillating shaker is then filtered in a dry conical flask (when the flask is not dry, the initial filtrate can be discarded), which is a soil available nutrient test fluid. This solution can measure ammonium nitrogen in the soil and is effective Phosphorus and available potassium.
Note 1: The northern soil extractants are mainly used for calcareous and neutral soils but also for slightly acidic soils, but not for strongly acidic soils. Southern soil extractants can only be used in acidic soils in the south.
Note 2: The oscillation frequency and intensity during leaching have a significant influence on the reproducibility of the measurement results. It is recommended to use the recommended oscillator.
Note 3: The filtered test solution should be covered at any time and measured as soon as possible. It should not be put for a long time, otherwise it will easily cause loss of ammonium nitrogen.
Note 4: Ambient temperature has a certain influence on the determination, especially on phosphorus. When the room temperature is lower than 20-25°C, it is recommended to preheat the soil extract to 30°C.
1. Before the color comparison, the cuvette should be cleaned. The cuvette should be clean or not, which directly affects the colorimetric result. Pay attention not to touch the optical surface on the cuvette with hands or rub the optical surface with hard paper or cloth. .
2. The 4 cuvettes on the instrument are equipped with matching cuvettes. After the same solution is loaded, the reading error is ≯ 0.5. If users purchase cuvettes themselves, they must be checked for compatibility. Do not use the cuvettes. The cuvette color comparison.
3. When drip the drops into the small glass bottles, the drip bottles should be in the vertical position. Each drug should be added dropwise to the blank, the standard solution, and the small glass bottle of the test solution, such as drops. Add ammonium nitrate nitrogen color reagent, the first drop, the fourth drop, the seventh drop add the blank liquid, the second drop, the fifth drop, the eighth drop add the standard liquid, the third drop, the sixth drop, the ninth Drops are added to the test solution to prevent solid residues from the dripper from causing test errors.
4, after the completion of a liquid drop, to shake, so that it is fully mixed, plus a second liquid.
5. When the drop bottle is left unused for a long time, the dripper should be removed before starting use, and the solid attachment in the dripper should be washed, then rinsed with distilled water and then put back into the dropping bottle and used again. The bottle is inverted for half an hour and the first few drops are discarded and then used again.
6. If there is liquid splashed out of the cuvette, it must be wiped dry with a mirror paper, otherwise it will cause light scattering, leading to a large test error.
7. When you stop using it, unplug the adapter.
8. During the measurement, be careful not to splash liquid on clothes, prevent some acid and alkali liquids from burning clothes and skin, and wash your hands after the end of the measurement work to prevent the entry of certain toxic liquids. The medicine should be placed so that children cannot touch it.