Determination of malachite green and colorless malachite green in aquatic products

Scope of application: suitable for the detection of malachite green and colorless malachite green in fish, shrimp, crab, turtle and other aquatic products. Method principle: Add hydroxylamine hydrochloride, p-toluenesulfonic acid, ammonium acetate and acetonitrile solution to the sample. After centrifugal precipitation, take the supernatant and add water, diethylene glycol and methylene chloride for liquid-liquid extraction. , Reversed-phase high-performance liquid chromatography separation.

Hand Push Brush Cutter

Small hand push Brush Cutter is also called small harvester, cutting and irrigation machine. It has broken through the operation bottleneck of rural areas unable to enter the large harvester harvest, promoted the mechanization of harvest operations, shortened the labor cycle, and freed people from heavy manual labor. The mower can harvest rice, harvest wheat, harvest soybeans, harvest corn, and make it tidy, and can also cut shrubs, weeds, branches, etc. Mower with gasoline power powerful, convenient and practical, high efficiency, easy to carry and field operations. The gasoline engine has low noise. Quiet and comfortable characteristics. Let people everywhere work long hours without feeling tired

Hand Push Brush Cutter,Grass Trimmer With Wheels,Cordless Brush Cutter

Shaoxing Haotuo Machinery CO., LTD. , https://hotochainsaw.com