The registration for the 22nd Needle/Leaf Interlaboratory Comparison Test is open up from now – a detailed invitation paper were submitted to the laboratories in February 2019. The evaluated parameters are N, S, P, Ca, Mg, C, Fe, Mn, Zn, Cu, Pb, Cd, B, As, Cr, Co, Hg and Ni. Detailed information and the registration page you can find here.
If your laboratory wants to take part and got no invitation please contact me per email!
All the best,