2,4-Dimethylphenol, 100 µg/ml, Methanol, 5ml

2-Perfluorooctyl ethanoic acid (8:2), 50µg/ml in Isopropanol, 1,2ml

1,3,6,8-Tetrachloro-9H-carbazole, 1.2ml x 50ug/ml, nonane

WP Total Hardness