Soil pH is one of the most important basic properties of soil. The availability of essential nutrients for most crops is related to the pH of the soil. Therefore, understanding the pH status of soil is important for understanding the effectiveness of soil nutrients and recommending fertilization. . While measuring soil nutrients, soil pH measurement is also an indispensable indicator. First, the principle of the method Soil pH measurement methods can be roughly divided into potential and colorimetric methods. With the development of analytical instruments, soil laboratories have basically adopted the potentiometric method, and potentiometric methods have the advantages of accuracy, speed, and convenience. The potentiometric method is used in the ASI method. The basic principle is that when a pH meter is used to measure the pH of the soil suspension, the potential difference is generated due to the difference in the activity of the solution H+ ion inside and outside the glass electrode, that is: Where: a1 is the H+ ion activity of the solution in the glass electrode, and the value is fixed. A2 is the H+ ion activity of the solution outside the glass electrode, ie the activity of H+ in the solution to be tested. It can be seen from the above equation that the potential difference between the inside and outside of the glass electrode is determined only by the activity of H+ in the test solution, and the negative logarithm value is the pH. The pH of the solution can be read directly from the pH meter by switching on the pH meter. Second, reagent preparation 1. pH 4.01 Standard Buffer Solution Weigh 10.21 g of potassium hydrogen phthalate (KHC8H4O4, analytical grade) dried at 105°C in a 1000 ml volumetric flask and dissolve to volume after dissolution. 2. pH6.87 Standard Buffer Solution Weigh 3.39g of potassium dihydrogen phosphate (KH2PO4, analytical grade) dried at 50°C in a 1000ml volumetric flask, and dissolve to volume after dissolution. 3. pH9.18 Standard Buffer Solution Weigh 3.39 g of borax (Na2B4O7•10H2O, analytical grade) in a 1000 ml volumetric flask and dissolve to volume after dissolution. Third, the operation steps (I) Instrument calibration To check the pH with a standard buffer, two different pH buffers must be used, one at pH 4.01, one at pH 6.87, or one at pH 6.87 and one at pH 9.18 depending on the pH of the soil It is appropriate to approach this pH of the soil. During the test, first insert the electrode into a buffer, turn on the power, after adjusting the zero point and temperature compensation, set the baffle to the pH level and use the “positioning†adjustment knob to adjust the reading to the pH of the standard buffer. This time the adjustment is Electrode asymmetric potential, after a buffer correction, if the electrode is intact or the instrument has been working under normal conditions, the allowable deviation should be within 0.02 (pH 7.00±0.02) when checking with the second buffer. If there is a large deviation, the electrodes must be replaced and the instrument must be checked. (b) Determination of soil pH 10 ml of the soil sample was placed in the sample cup and 25 ml of boiled cooled pure water was added with the extract dispenser, stirred for 10 minutes on a blender, allowed to stand for 30 minutes, and then the pH was measured with a pH meter. Reading the reading directly is the soil pH.
The Road Line Marking Machine is suitable for marking lines on the plastic running tracks or artificial lawns.
4. Road line marking machine runs by pushing,with convenient turning ,reliable orientation and flexible turning.
Main scope: Concrete Grinding machines, Floor Polishing Machines, Road Line Marking Machines, Truck Cranes, Road Rollers, excavators, Concrete Leveling Machines, Power Trowels and other Construction machinery .
Jining oking tec co.,ltd, established in 2010, is a professional manufacturer engaged in the research, development, production, sale and service of Concrete Grinding machines, Floor Polishing Machines, Road Line Marking Machines, Truck Cranes, Road Rollers, Excavators, Concrete Leveling Machines, Power Trowels and other Construction machinery .
We are located in Jining city,Shandong province with convenient transportation access. Dedicated to strict quality control and thoughtful customer service, our experienced staff members are always available to discuss your requirements and ensure full customer satisfaction.
In recent years, we have introduced a number of advanced production equipment, and also have an excellent production team and a complete quality assurance system to ensure that each batch of goods is delivered to customers in a timely and high quality.
We also have an excellent management team, experienced technical staffs and professional sales team to solve all problems you encountered before and after sales. In addition, we have obtained I S O 9 0 0 1:2 0 1 5 certificates. Selling well in all cities and provinces around China, our products are also exported to clients in such countries and regions as United States, Europe,Australia, Southeast Asia,Russia,the Middle East,Africa. We also welcome OEM and ODM orders. Whether selecting a current product from our catalog or seeking engineering assistance for your application, you can talk to our customer service center about your sourcing requirements.
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2.Both sides of the spraying gun are equipped with a limiting disc plates, ensuringthe line free of raw edges, such plates may be lift through a pulling line insteering, turning flexibly;
3.The spraying gun may be conveniently dismantle different nozzles and control theline width,suitable for common airless spraying for marking or labels;
April 06, 2021