Suggestion for new measured quantity: Concentration Pb

There is a suggestion for a new measured quantity 'Concentration Pb' by nils.brinckmann@gfz-potsdam.de.

Check it out at https://sms-cv.helmholtz.cloud/sms/cv/app/measuredquantity/390/change/.

Please have a look @nils.brinckmann, @paul.remmler