The present invention provides a new device for use in measuring lead levels in biological and environmental samples. Using square wave coulometry and colloidal gold particles impregnated on carbon electrodes, the present invention provides a rapid, reliable, portable and inexpensive means of detecting...http://www.google.com/patents/US5468366?utm_source=gb-gplus-sharePatent US5468366 - Colloidal-gold electrosensor measuring device
