Determination of Ammonium Salt Content in Soy Sauce by Automatic Nitrogen Determinator
As an important form of Centrifugal Pump, double suction pump is widely used in engineering because of its high lift and large flow. The impeller of this pump type is actually a combination of two back-to-back impellers, and the water flow from the impellers merges into a volute. The double-suction pump has the following characteristics: it is equivalent to two single-suction impellers of the same diameter working at the same time, and the flow rate can be doubled under the same outer diameter of the impeller; the pump casing is horizontally opened, which is convenient for inspection and maintenance. The inlet and outlet of the suction pump are in the same direction and perpendicular to the pump shaft, which is conducive to the arrangement and installation of the pump and the inlet and outlet pipes; the impeller structure of the double suction pump is symmetrical, there is no axial force, and the operation is relatively stable. Double Suction Pump,Double Suction Centrifugal Pump,Double Suction Water Pump,Carbamide Pump Jiangsu Qiantu Trading Co., Ltd. , https://www.qiantupump.com
Take 2ml sample and add 150ml water and 19magnesia to the digestive tube, place it directly on the automatic nitrogen determination instrument for distillation test, and do blank test at the same time. The entire measurement process is automatically performed from distillation, titration, data processing and result printing. Take 6 different kinds of samples, add a certain amount of sulfuric acid according to the test, and carry out the standard recovery test. The recovery rate of the added standard is between 90% and 102.9%, and the average recovery rate is 97.8%. Claim. For different kinds of samples, salt content was determined by semi-micro determination method and automatic nitrogen determination instrument. The t-test, P>0.05, proved that there was no significant difference between the two methods, and met the requirements of the method.
Boric acid absorption liquid plus human indicator must be accurate, otherwise it will affect the end of titration. According to the preparation method required by automatic azotometer, 1L boric acid absorption solution was added with 10ml 1g/L acetochlor green indicator and 10ml 1 year old L-methyl red indicator. To judge whether the preparation is accurate, it is advisable to take 25ml of boric acid solution with 100ml of distilled water and mix. The solution should be blue-gray. If it is still red, use a 1mol/L concentration of sodium hydroxide solution to adjust the boric acid solution to blue-gray. until. According to the principle of reaction, barium sulfate can be used as a standard substance for recovery.
Through rigorous scientific experiments, the use of automatic nitrogen determination of salt in soy sauce, has many advantages, the first operation is simple, fast, with a high degree of precision accuracy, a sample can be read directly in just 6min The results are applicable to the determination of large quantities of samples, and the automatic nitrogen determination instrument is worthy of popularization and application.