Easy to Understand the QuEChERS
Take the example of pear test to check whether a pear is up to the standard. Prepare the environment The first step: Suitable Acetonitrile salting-out extraction environment was prepared. Make the pears into a puree, take 10g to QuEChERS centrifuge tube of 50ml. Add extract solution (acetonitrile) and Salt into acetonitrile solution(to create an aqueous environment ), then repeatedly shaken to ensure that the pesticide is dissolved into acetonitrile solution. QuEChERS Block ceramics to vortex can be added to accelerate the homogenization process. Dispersive and extraction The Second step, dispersive and extraction twice. Vortex the sample vigorously for seconds and then centrifuge for minutes. The resulting sample will show three layers finally: acetonitrile and the extracted compounds of interest is the top one. The remaining solids from the sample are in the middle layer. Aqueous, containing the excess salts from extraction salt packed is the lower layer. Transfer the top acetonitrile and the extracted compounds layer to the prepared tube and add into adsorbents as a purification agent which will remove matrix interferences. Vortex and then centrifuge the tube containing the adsorbents for minutes again. Remove the supernatant after secondary centrifugation and finally get the pure solution containing pesticide residues. Analyze The third step, Analyze. Analysis of the concentration and content of pesticides, determine whether the standard
Contact : Bruce Lu, +86 29 89284429
Good deal: buying from seller
We invite you to read our terms of use. You can also visit our FAQ section and see our information section on the risks associated with counterfeiting.
This page is about importers and exporters of Easy to Understand the QuEChERS Search in a category : Everything else / Bulk Search in a category : understand, easy, quechers |
Tuesday, June 04, 2013
VOTRE COURRIER POSTAL SUR INTERNET (BACKOFFICE) www.ubidoca.com Vous voyagez très souvent ? Vous travaillez beaucoup à l'étranger ? Vous avez plusieurs domiciles ? Nous fournissons la solution la plus efficace pour gérer vos affaires et votre courrier postal à distance sur Internet. Nos services - Mise de votre courrier postal sur Internet dès réception par notre équipe. - Vous pouvez le consulter 24h/24, o...
UBIDOCA SARL
- courrier
- 01220 - Divonne les Bains
- 04 50 20 49 70
- 06 18 63 06 53
Tuesday, August 11, 2015
Quantity : 500 - Price : 220-225
Key Specification - l Brand Name : Rooman - l Model Number : RM-RC800 - l Input Voltage(V): 110-220 - l Output Voltage(V): 24 - l Rated Power(W): 22 - l Noise Level(DB): <60</li> - l Display Mode : LED - l Certification : RoHS、3C - l Battery Voltag/Battery Type ...
Rooman Electrical Appliances Co., Ltd.
- Rooman1
- 523929 - Dongguan
- +13 6 62 88 32 70
Tuesday, August 11, 2015
Quantity : 500 - Price : $145~165
- Key Specification - - Color: Various color can be chosed - Input Voltage (V): 120~240V - Rated Power: 50-60HZ - Power (W): 36~55W - Noise Level: 25~55dB - Display Mode:LED - Control Mode:Touch screen - CADR:450m³/H - Purifying Rate:99.7% - Length of Power Cord: 2.2M standard or...
Rooman Electrical Appliances Co., Ltd.
- Rooman1
- 523929 - Dongguan
- +13 6 62 88 32 70