Fluorene, 10µg/ml in Acetonitrile, 10ml

Potassium (K), 1000µg/ml in 2%-HNO3/Water, 100ml

PAH-Mix 24 deuterated, 10 ng/µl, 1ml

Chromium (Cr), 1µg/ml in 2%-HNO3/Water, 4 x 25ml