Everything else / Bulk

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

Location : Xi'an City , Shaanxi Province, P.R.China, 710077 Xi'an,
Contact : Bruce Lu, +86 29 89284429

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Spain 46015 Construction goods
Shower Color Changing with Water Temperature - PR002028

Thursday, August 29, 2013

Quantity : 24 - Price : 5.25 Eur

Shower Color Changing with Water Temperature Ole, shower with bright colors! This new dock for your shower with LEDs makes you enjoy a new experience when you shower. No batteries required! She with the force of water generates energy for the birth of their LEDs, that will vary...

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  • 902099937
Korea (Republic) 411-808 Health / Hygiene
AFB Fluorochrome Auto Slide Stainer

Thursday, September 27, 2012

Quantity : conference - Price : conference with clie

This Auto Stainer provides fast, easy and stable staining process for staining sputum specimen (for detecting Tubercle Bacillus) according to Fluorochrome staining method by automated system control. This new innovated stainer features advanced functions and performances over manual...

Dagatronics Corporation

  • 411-808 - Geonggi-do
  • +82 3 19 16 80 05
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Heavy Duty VINYL / PVC Coated Fabric for Aprons & Adult Bibs

Tuesday, September 01, 2026

Heavy Duty VINYL / PVC Coated Fabric for Aprons & Adult Bibs Waterproof Top: PVC Film Bottom: %100 polyester Color: White, Navy Blue, Light Blue, Green, Black and etc Easy wipe cleanable Fully protects against the liquids Anti Static Anti Fungus Anti Bacterial Anti...

Anatolia Textile LTD