Physicochemical or geochemical

• Horwell, C. J., (2007), Grain size analysis of volcanic ash for the rapid assessment of respiratory health hazard, Journal of Environmental Monitoring, 9(10), 1107 - 1115, 10.1039/B710583P

Personal, ambient & remote monitoring/sensing

• Horwell, C. J., Allen, A. G., Mather, T. A., Patterson, J. E., (2004), Evaluation of a simple passive sampling technique for monitoring volcanogenic hydrogen sulphide, Journal of Environmental Monitoring, 6, 630-635, 10.1039/b400746h

Physicochemical or geochemical

• Gomez, D., Smichowski, P., Polla, G., Ledesma, A., Resnizky, S., Rosa, S., (2002), Fractionation of elements by particle size of ashes ejected from Copahue Volcano, Argentina, Journal of Environmental Monitoring, 4(6), 972-977, 10.1039/B207080B