P2019-RT

Dithiocarbamates in tomato and citrus fruits

The proficiency test evaluates the performances of laboratories with respect to their ability to quantify dithiocarbamates as CS2. 

The test materials are prepared of organic tomatoes and citrus fruits, both free from incurred residues of dithiocarbamates at a level of 0.01 mg/kg. The tomatoes resp. citrus fruits are homogenised and spiked with dithiocarbamates thereafter. Liquid nitrogen is used throughout the whole process of preparation, spiking and bottling of the test material to keep the material in deep-frozen condition. The test material consists of a powdery ice. Therefore, sub-samples can be taken without thawing the test samples.
The sophisticated process of test material preparation at very low temperatures avoids a degradation of thiram and the loss of CS2. The spiked levels are confirmed in the test material during homogeneity and stability testing. 

A reporting limit of 0.01 mg/kg is required.

Parameters

Test material tomato

Dithiocarbamates, expressed as CS2

Test material citrus fruit

Dithiocarbamates, expressed as CS2

Expected time schedule

Please register before:
11 September 2020
Dispatch of samples:
10 November 2020
Deadline for reporting results:
20 November 2020

Costs of P2019-RT

Ring test and material Amount Price per unit
Dithiocarbamates in tomato and citrus fruits 890 €
Test material tomato
Tomato homogenate, spiked with dithiocarbamates
80 g included
Test material citrus fruit
Citrus fruit homogenate, spiked with dithiocarbamates
80 g included
Blank material tomato
Tomato homogenate, unspiked
40 g 70 €
Blank material citrus fruit
Citrus fruit homogenate, unspiked
40 g 70 €

Note: PROOF-ACS reserves the right to cancel tests in case of less than ten participants.