Polar pesticides/contaminants in black tea

Ring test P2615-RT is designed to cover the most frequent polar pesticides and contaminants in black tea.

The test material consists of black tea (milled, 100 g), spiked with

anthraquinone,
biphenyl,
chlorate and perchlorate,
nicotine,
glyphosate, AMPA, trimesium,
diquat and paraquat,
matrine and oxymatrine,
2-chloroethanol / ethylene oxide, and
inorganic bromide.

The basic module (anthraquinone, biphenyl, chlorate, perchlorate, and nicotine) is included in the price of the ring test. The participants are free to choose the additional modules glyphosate, AMPA and trimesium (module 1), diquat and paraquat (module 2), matrine and oxymatrine (module 3), ethylene oxide (module 4), and inorganic bromide (module 5).

The analytical data are assessed with respect to

the comparability (z-score), and
the trueness (70 to 120% of the spiked level, as far as scientifically reasonable).

Parameters

Basic module

anthraquinone, biphenyl, chlorate, perchlorate, nicotine

Module 1

glyphosate, AMPA, trimesium

Module 2

diquat, paraquat

Module 3

matrine, oxymatrine

Module 4

2-chloroethanol, ethylene oxide, ethylene oxide (sum)

Module 5

inorganic bromide

Expected time schedule

Please register before:
01 December 2025

Dispatch of samples:
16 February 2026

Deadline for reporting results:
10 March 2026

Costs of P2615-RT

Ring test and material	Amount	Price per unit
Polar pesticides/contaminants in black tea	–	850 €
Test material Black tea, milled, spiked	100 g	included
Basic module anthraquinone, biphenyl, chlorate, perchlorate, nicotine.		included
Module 1 glyphosate, AMPA, trimesium		200 €
Module 2 diquat, paraquat.		200 €
Module 3 matrine, oxymatrine.		200 €
Module 4 ethylene oxide / 2-chloroethanol.		150 €
Module 5 inorganic bromide.		150 €
Blank material Green tea, milled, unspiked.	100 g	included

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