We would like to purchase an easy to use instrument to meet the EPA 279.11 spec. This requires MQL's of 5ppm Arsenic, 2ppm Cadmium, 10ppm Chromium, 100ppm Lead, 1000ppm Chlorine, and 20ppm Sulfur. We have been looking at EDXRF but are starting to come to the conclusion that they are not capable. The instrument will be in a used oil terminal and needs to be robust. Does anyone have any suggestions?