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Paraquat and Diquat in Difficult Matrices

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The herbicides paraquat & diquat are among the most often used plant protection agents in the world. They have been successfully used as a herbicide for many crops for the last 50 years in more than 100 countries. Paraquat has many advantages. It works quickly, is resistant to rain and is also effective against plants which have become resistant to other herbicides.

Both substances are extremely poisonous and must be applied properly.

It is very difficult to analyse paraquat because of its unusual chemical properties such as its high rate of adsorption to glass surfaces. A robust method of analysis must guarantee that the analyte from the chia seed - a substance with a high fat content which swells a lot - is extracted, and that the procedure completely extracts the paraquat bonded to the mucopolysacharides.

The new maximum resident level (MRL) for diquat has been determined by Regulation (EU) 2016/1002 on 17 June 2016, which modifies App. II, III and V of Regulation (EU) No. 396/2005.

Eurofins can analyse the newly established maximum residue levels (MRLs) of paraquat and the structurally related diquat in fruit and vegetables as well as chia seed with an LOQ of 0.01 mg/kg.

Eurofins frequent and successful participation in interlaboratory tests and its more than 3000 tested samples of paraquat and diquat prove Eurofins to be a competent and strong partner.

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