Variable
cobalt
zinc
sodium
selenium
barium
rubidium
antimony
lead
calcium
sulphate_corrected
cerium
nitrate
thorium
strontium
copper
arsenic
chromium
phosphorus
chloride
nickel
potassium
sulphate_total
bismuth
lanthanum
magnesium
iron
aluminium
titanium
thallium
uranium
tin
lithium
ammonium
cadmium
vanadium
manganese