title: Magnetic circular dichroism spectroscopy. A definitive method for the determination of urinary porphyrins.
mesh_terms: D020261:Arsenic Poisoning; D002942:Circular Dichroism; D005069:Evaluation Studies as Topic; D006801:Humans; D007854:Lead / Q000652:urine; D007855:Lead Poisoning / Q000175:diagnosis / Q000652:urine; D007982:Levulinic Acids / Q000652:urine; D008280:Magnetics; D008722:Methods; D011166:Porphyrins / Q000652:urine*
chemical_list: D007982:Levulinic Acids; D011166:Porphyrins; D007854:Lead