Three Biggest Improvements After QuEChERS Was Proposed In 2003
0402
Donnez votre avis
Lire les avis
Ajouter au pense-bête
Imprimer
  • 2.4/5
  • 1
  • 2
  • 3
  • 4
  • 5
Détails
Chine (Rép. pop) Divers

Signalez un abus

Divers

Three Biggest Improvements After QuEChERS Was Proposed In 2003

QuEChERS firstly came out in 2003. The inventors of QuEChERS, Michelangelo Anastasiades and Steve Lehotay, were asked for the three biggest improvements in this method from development to now. They made the following statement.

In the period of conceiving the method QuEChERS, we have conducted many experiments on a wide range of representative pesticides and samples to evaluate each step of the process of extraction and purification.

The earliest version of QuEChERS proposed in 2003 was good for the tested object and its substrates, which is even better than the current version.
When the experimenters test and verify the method with hundreds of pesticides in different samples, they found that the recovery of about 10 pesticides was easily affected by the pH value of solutions. And when the pH value of solutions is five, the results will be accurate than other values. That's the reason why they pay attention to the used of buffer in the later methods. This is the first improvement of the method, even if the buffer will lead to an increase of some impurities.

Secondly, adding C18 filler together with PSA can significantly improve the purifying effect of some samples, especially those rich in oil, such as olive oil, which does not cause the loss of the tested products. Some chemists use freezing methods to reduce the interference of lipids, which can also remove some impurities from previous extractions.

By contrast, the method of adding C18 is undoubtedly faster and easier, and the effect of decreasing is comparable to that of freezing.
At last, when removing the impurities such as chlorophyll and carotenoids, the experimenters can add a small amount of graphitized carbon black or the adsorbents as described in CEN standard method 156627.

Localisation : Xi'an City , Shaanxi Province, P.R.China, 710077 Xi'an,
Personne à contacter : Bruce Lu, +86 29 89284429

hawachsci

  • 3.4/5
Détail
Inscrit le 01 mars 2019

Numéro d'identification de la société : 91610000059692822B

Site web : www.hawach.com/

Envoyer un email à hawachsci

Bonne affaire : acheter au vendeur

Consultez notre guide pour effectuer une transaction en toute sécurité ! En aucun cas Algomtl ne peut être tenu responsable des annonces publiées. Seule la responsabilité du vendeur ou de l'acheteur en cas de litige est engagée.
Nous vous invitons à lire nos conditions générales d'utilisations. Vous pouvez aussi vous rendre sur nos FAQ et consulter notre page d'informations sur les risques liés à la contrefaçon.
Cette page concerne les importateurs et exportateurs de
Three Biggest Improvements After QuEChERS Was Proposed In 2003

Rechercher dans la catégorie : Divers
Rechercher dans la catégorie :
after, improvements, three, proposed, biggest, quechers
  • 3.7/5
  • 1
  • 2
  • 3
  • 4
  • 5
France 75001 Biens d'équipement

Signalez un abus

Broyeur à Sable VSI
Broyeur à Sable VSI

Wednesday 06 August 2014

Type: Concassage tertiaire Taille d'alimentation: 0 –50 mm Matériel à traiter: minerai de fer, minerai de cuivre, minerai d'or, minerai de manganèse, minerai de zinc, gravier de rivière, gravier, calcaire,gangue de charbon, quartz,basalte. Applications: béton bitumineux, sable...

Henan Liming Heavy Industry Science & Technology Co.

  • 75001 - paris
  • 08 63 72 12 34
  • 3.4/5
  • 1
  • 2
  • 3
  • 4
  • 5
Thailande 10150 Alimentaire

Signalez un abus

Refined White Cane ICUMSA45 Sugar & Sweeteners GRADE A FOR SALE HOT SALES
Refined White Cane ICUMSA45 Sugar & Sweeteners GRADE A FOR SALE HOT SALES

Wednesday 23 December 2015

Prix : $250 / MT CIF

ICUMSA 45 is a highly refined sugar, and it is easily recognizable by its distinctive sparkling white color and pure Sucrose taste. It is suitable for human consumption and use in a wide range of food applications. It is perpetually in high demand as it is the safest form of sugar...

Khun Jack Partnership Limited

  • 10150 - chaing Mai
  • +66 9 56 19 49 81
  • 2/5
  • 1
  • 2
  • 3
  • 4
  • 5
France 13300 Habillement / Mode

Signalez un abus

ARRIVAGE KAPORAL JEANS
ARRIVAGE KAPORAL JEANS

Tuesday 25 November 2025

Quantité : 3000 - Prix : 25,00 €

*************** MYLOOKDISCOUNT *************** ARRIVAGE KAPORAL JEANS HOMME ET FEMME. jeans, Dès 25€ ht pièces. TOUS NOS PRODUITS SONT DISPONIBLES ET DIRECT EN ENTREPÔT. MYLOOKDISCOUNT C'EST PLUS DE 20 000 ARTICLES TRAITES CHAQUE MOIS. Nous sommes spécialisés dans le commerce de gros...

webshop

  • newlookdiscount
  • 13300 - salon de provence
  • 09 72 31 67 88