Soil organic matter is an important source of various nutrients in the soil, especially nitrogen and phosphorus. It also contains humic acids and other substances that stimulate plant growth. Because it has colloidal properties, it can adsorb more cations, thus making the soil fertility and buffering. It can also loosen the soil and form structures that can improve the physical properties of the soil. It is also an essential carbon source and energy source for soil microorganisms. Therefore, in addition to the low-lying land, in general, the amount of soil organic matter is an important indicator of the level of soil fertility. Related soil organic matter (nutrient) measuring instruments please see: http://?xtkeyword=Soil nutrient&page=1 Hydraulic system concrete pump; lightweight concrete pump
5). Conveying or injection of plain concrete and fiber concrete for all kinds of engineering construction
Product Application:
1.In building engineering, it is used for horizontal and vertical transportation of mortar.
2.In chemical industry and papermaking industry, conveying slurry raw materials and waste materials.
3.The use of fly ash slurry in the power plant
4. Used for grouting and revetment in national defense, civil air defense engineering and mine tunnel construction.
5. For highway pavement maintenance, grouting is used for cement pavement collapse.
6. In water conservancy projects, it is used to reinforce the dam.
7.In metallurgy, steel and other industries, it is used to maintain grouting for blast furnace and other equipments.
pump, concrete pump, mixer pump, concrete mixer pump, conveyor pump Zhengzhou SMART Machinery Manufacture Co.,Ltd , https://www.simamax.com
Instruments, Equipment and Reagents
1. Instruments and equipment Hard test tubes, oil bath digestion devices (including oil baths and wire cages), adjustable temperature furnaces, stopwatches, and automatic temperature control regulators.
2. Reagents
(1) 0.800 0mol·L-1 Potassium Dichromate Standard Solution: Dissolve 39.2245 g of potassium dichromate (K2Cr207, analytical grade) dried at 130°C in water to a volume of 1000 mL.
(2) 0.2mol·L-1FeS04 solution: Weigh 56.0g of ferrous sulfate (FeS04·7H20, chemically pure) into water, add 5mL of concentrated sulfuric acid, and dilute to 1L.
(3) Indicator 1 O-Phenanthroline Indicator: Weigh out 1.485 g of o-phenanthroline (Analytical Pure) and FeS04.7H 200.695 g, and dissolve in 100 mL of water.
22-Carboxydiphenylamine (o-phenylanthranilicacid, also known as o-phenylaminobenzoic acid, C13H11O12N) Indicator: Weigh 0.25
G reagent in a small mortar and pestle research, and then poured into a small 100mL beaker, add 0.1mol · L-1NaOH solution 12mL, and use a small amount of water to rinse the residual reagent in the mortar in a 100mL beaker, the beaker on a water bath heating Allow it to dissolve, dilute to 250 mL after cooling, place clear or filter, and use its serum.
Method and procedure
1. Sample Preparation Weigh 0.1 to 1g (accurate to 0.0001g) of 0.14mm (100 mesh) sieve air-dried soil samples, place 6-8 dry hard test tubes, and accurately add 0.8000 with a pipette. mol·L-1 Potassium dichromate standard solution 5mL (If the soil contains chloride, it needs to be added first (Ag2S040.1g), add concentrated H2S04 by syringe
Shake 5mL thoroughly and cover the neck with a small funnel.
2. Measurement
1 Place 8 to 10 test tubes (with 1-2 blank tubes per cage) in a wire cage, place a paraffin oil bath at a temperature of 185 to 190°C, and control the electric furnace so that the temperature inside the oil bath It is always maintained at 170～180°C. When the liquid in the test tube boils, start timing and boil 5
Min, remove the test tube, and wipe the external oil of the test tube after it is cold.
2 After cooling, inject the test substance into a 250 mL conical flask, wash the inside of the test tube and the small funnel with water, so that the total volume of the solution in the flask reaches 60 to 70.
In mL, keep the sulfuric acid concentration in the mixture at 2 to 3 mol·L-1, then add 12 to 15 drops of 2-carboxydiphenylamine indicator, and the solution is brownish red. With the standard 0.2mol·L-1 ferrous sulfate titration, during the titration constantly shake the flask, until the color of the solution turns from reddish purple to dark green (grey blue-green), which is the end of the titration. Such as with o-orpine porphyrin indicator, plus 2 to 3 drops of the indicator, the process of discoloration by the orange-blue-green-brick red is the end. Record Pml4 titration ml (y).
Simultaneously with the determination of each batch of samples, 2 to 3 blank tests were performed, ie, 0.5 g of powdered silica was used in place of the soil samples, and the other procedures were the same as those for the samples. Record the number of milliliters (Vo) of FeS04 titration, and take the average value.
3. Calculation
Where: c - the concentration of potassium dichromate standard solution, mol · L-1
Vo - blank titration with FeS04 volume, mL;
3.0 - 1/4 carbon atom molar mass, g · mol-1
1.1 - oxidation correction factor;
m - dry soil quality, g;
k - Convert dry soil into coefficient of dry soil.
Soil organic matter (g・kg-1) = Soil organic carbon (kg-1) Х 1.742
Where: 1.724 is the average conversion coefficient of soil organic carbon exchanged into soil organic matter.
Precautions 1 Those with an organic matter quality higher than 50g・kg-1, weighing 0.1g soil sample, containing 20-30g・kg-1 organic matter, 0.3g soil sample, weighing less than 20g・kg-1 g above.
2 The presence of chloride in the soil can lead to high results. Because chloride can also be oxidized by potassium dichromate, the determination of organic matter in saline soil must be prevented by chloride interference. A small amount of chlorine can be added with a small amount of Ag2SO4 to precipitate the chloride. The addition of Ag2SO4 not only precipitates chloride, but also promotes the decomposition of organic matter. The amount of Ag2SO4 can not be too much, about 0.1g, otherwise it will precipitate Ag2Cr2O7, affecting the titration.
3 It is necessary to start the boiling on the surface of the solution in the tube before calculating the time. Master boiling standards as consistent as possible, and then continue to cook 5min, cooking time has a greater impact on the analysis results, it should be as accurate as possible.
4 The color of the boiled solution should generally be yellow or slightly greenish. If the color is green, the amount of potassium dichromate is insufficient. If the amount of ferrous sulfate consumed is less than 1/3 of the blank amount during titration, there is a possibility of incomplete oxidation, and redoing should be discarded.
Concrete trailer pump is a set of mechanical, electrical and hydraulic technology as one, with reliable performance of smooth operation and strong pumping capability. Reliability and stability is guaranteed by automatic engine regulation.
1) Convey floor heating lightweight foamed cement, mortar, fine aggregate concrete.
2) Convey all kinds of engineering construction in the plain concrete, fiber concrete.
3) Conveying or injection of refractory and thermal insulation material;
4).Conveying or jet of greening soil on the construction of ecological environment;
