Related by context. Frequent words. (Click for all words.) 75 ppb 73 #ppm [001] 72 #ppm [003] 60 mg l 57 micrograms 56 microgram 54 nanograms per 54 ° C 54 milligrams 52 ppb Au 52 μg 51 per milliliter 51 º C 51 concentrations 50 Concentrations 50 ppb gold 50 ppt 50 ng ml 49 mg kg 49 #g t [003] 49 ppm U#O# 49 microns 49 μm 49 degrees Fahrenheit 48 mg 48 nanograms 48 ° F 48 pH 47 g t silver 47 opt Au 47 mmol L 47 #.#mg [004] 46 gpt silver 46 ° C. 46 sulfate 46 PM# [003] 46 ng mL 46 cesium 46 iodine 46 mg dL 46 g t Ag 46 mcg 46 degrees Celsius 46 becquerels 46 #dpi [002] 46 milligram 46 grams tonne 46 g tonne 45 #g t [002] 45 grams 45 arsenic 45 #.#g [002] 45 degree Celsius 45 radioactive cesium 45 microgrammes 45 mL 45 % Li2O 45 chromium 45 % Cu 44 Iodine 44 g dL 44 #.#g t [006] 44 t Au 44 dpi 44 mg d 44 microsieverts 44 atmospheric CO2 43 g t 43 mg dl 43 degrees Centigrade 43 atmospheric carbon dioxide 43 #mg [002] 43 ml 43 mSv 43 nitrogen dioxide 43 ° F. 43 ozone 43 g Au 43 dioxins 43 psi 42 nitrate 42 oz ton 42 mercury 42 oz t 42 grayscale 42 g t gold 42 degree celsius 42 trace amounts 42 #.#g t Au [006] 42 degrees centigrade 42 wt 42 gigatons 42 sulphate 42 antimony 42 radioactive iodine 42 Pb 41 #.#g t Au [001] 41 picocuries per 41 benzene 41 greenhouse gas concentrations 41 mL min