The registration for the 21th Needle/Leaf Interlaboratory Comparison Test is open up from now – a detailed invetation paper will be submitted to the laboratories in February 2018. The participation fee is 250€. The possible 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 you want to take part and got no invitation please contact me per email!
All the best,