Airborne mercury speciation at the western edge of the Houston Ship Channel, TEXAQS 2009 SHARP study
The resultant dataset showed GEM concentrations in the range of 1.2 (near normal background) to 8.8 ng m-3 in plumes. Reactive gaseous mercury varied from below detection limit (BDL) to ~90 pg m-3 in plumes. And fine particulate-bound mercury varied from BDL to ~100 pg m-3 in plumes.
During multi-day time periods when the mercury species were not directly enhanced by local plumes, GEM was elevated at night, typically peaking between 0300 and 0700 CST, while RGM and FPM species were enhanced during the day with very broad peaks centered at ~1500 CST. RGM and FPM (both water soluble) dropped to very low values during rain events.