As the sample is boiled, the test solution contains a higher concentration of sulfuric acid. According to reports, the sulfuric acid medium has a great influence on the determination of ICP-AES. Therefore, the method was used to optimize the selective test of sulfuric acid concentration, instrument operating parameters, and analysis conditions. A parallel test was performed on the plant standard substance shrub leaves GBWO76o3, and the relative standard deviation of each element was determined to be 1.6% to 26.2%; and the measured value and standard were as follows: the element content was> 100, 10 to 100, and 1 to 10 were mixed. The relative errors of the values ​​are <3.7%, <9.8%, <25%, respectively.
Weigh 0.500 plants sample dried at 80°C for 2h at the bottom of the Kjeldahl flask, add concentrated sulfuric acid 6m1, mix and infiltrate, slowly heat until white smoke starts, remove slightly cold (about lmin), add dropwise over 30 minutes. 20 drops of hydrogen peroxide, continue to heat micro-boil for a few minutes, remove and let cool, add hydrogen peroxide to teach drops, and repeat this many times until the cooking liquid is completely clear. The last emblem boiled for 5 min to dilute the remaining Hz } Zo After cooling, add 10 ml of water, transfer to a 50 ml flask, and allow to cool to volume. At the same time as a blank test. After standing clarified directly using ICP-AES method to determine the sodium, calcium, potassium, magnesium, iron, phosphorus, silver, Chin, manganese, zinc, turn, copper, yttrium, hunger, nickel and fifteen elements. The above test solution 5m1 was aspirated, and the nitrogen content not including nitrate nitrogen was measured by distillation.
The application analysis of the plant multiparameter analyzer showed that the content of the elements on the side of the plant was different by 5 orders of magnitude. There are matrix effects and spectral line interferences between elements. This method uses the test solution and the mixed standard solution to eliminate the influence of the matrix on the unity of ion concentration and medium.
Polypropylene, also known as Pp Resin, is a thermoplastic polymer used in a wide variety of applications. Virgin Pp Resin is produced via chain-growth polymerization from the monomer propylene.As one of Rubber And Plastic,like Eva Resin,Pvc Resin,Pp Resin Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar. Plastic Pp Granules Resin properties are similar to polyethylene, but it is slightly harder and more heat resistant. It is a white, mechanically rugged material and has a high chemical resistance.
Pp Resin is in many aspects similar to polyethylene, especially in solution behaviour and electrical properties. The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases. The properties of Pp Resin Polypropylene depend on the molecular weight and molecular weight distribution, crystallinity, type and proportion of comonomer (if used) and the isotacticity. In Pp Powder Resin, for example, the methyl groups are oriented on one side of the carbon backbone. This arrangement creates a greater degree of crystallinity and results in a stiffer material that is more resistant to creep than both atactic polypropylene and polyethylene.
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