Abstract: o-chloronitrobenzene, molecular formula is C6H4ClNO2, light yellow needle crystal. Insoluble in water, soluble in ethanol, ether and benzene. It is an important intermediate for pesticides, dyes and medicines, and can also be used as a raw material for rubber accelerator M.
P-chloro-o-nitroacetoacetanilide is an intermediate in the synthesis of pesticides quinquine, quinoxaline, and lencon. This article uses high performance liquid chromatography internal standard method to determine the content of p-chloro-o-nitroacetoacetanilide. The effective separation of chloro-o-nitroacetoacetanilide and its impurities is achieved, the operation is simple and fast, the results are reproducible, and the quantitative is accurate.
1. Reagents and solutions
Methanol: chromatographically pure, filtered through 0.45um filter membrane before use;
Water: freshly distilled double distilled water;
Tetrahydrofuran: analytically pure;
Pyrimethanil: No interfering impurity peaks;
Standard sample of p-chloro-o-nitroacetoacetanilide: known mass fraction> 94.6%.
2. Instruments
LC-3000 high performance liquid chromatograph; with variable wavelength ultraviolet detector;
LDT230 column thermostat;
All Chinese system anti-control software includes chromatographic workstation;
Chromatography column: C18 (150 mmx4.6mmx5um)) stainless steel column;
1 / 100,000 electronic balance;
Ultrapure water system;
Filter: The pore size of the filter membrane is about 0.45um.
3. Operating conditions of liquid chromatography
Mobile phase: methanol water = 65 35 (v / v); flow rate: 1.0 mL / min; column temperature: 30 ° C; detection wavelength: 252 nm; injection volume: 5 uL; retention time: p-chloro-o-nitroacetoacetanilide 6 min, pyrimethanil 11.1 min. The above liquid chromatography operating conditions are typical operating parameters. According to the characteristics of different instruments, the given operating parameters can be adjusted appropriately. In order to get the best results.
A grill cover is a protective covering that is used to protect a grill from various elements such as rain, snow, dust, and sunlight. It is typically made of durable materials such as polyester or vinyl, and is designed to fit snugly over the grill to provide maximum protection.
Grill covers are important for maintaining the longevity and performance of a grill. They help to prevent rusting, corrosion, and damage caused by exposure to the elements. Additionally, they also keep the grill clean and free from debris, which can affect the taste and quality of the food being cooked.
When choosing a grill cover, it is important to consider the size and dimensions of the grill to ensure a proper fit. Some covers also come with additional features such as adjustable straps, air vents, and storage pockets for added convenience.
Overall, a grill cover is an essential accessory for anyone who owns a grill and wants to protect their investment and ensure its longevity.
Outdoor Grill Cover,Bbq Grill Cover,210D Pvc Cover,Heavy Duty Waterproof Cover
vchomy , https://www.ivchomy.com