Archives of environmental contamination and toxicology

Lead speciation in artificial human digestive fluid.

PMID 12434225


For children, soil ingestion via hand-to-mouth behavior can be a main route of exposure to contaminants such as lead. The ingested lead can be mobilized from the soil and form new species during the digestion process. Speciation is known to affect the availability of metals for transport across biological membranes. In the present study, in vitro digestions were performed with (artificially contaminated) standard soil. Lead speciation was investigated in the artificial human intestinal fluid, i.e., chyme, to gain insight into the lead species and lead fractions that may be available for transport across the intestinal epithelium. To that end, both a lead ion selective electrode (Pb-ISE) and a voltammetric technique (differential pulse anodic stripping voltammetry, DPASV) were used. The results indicate that in chyme only a negligible lead fraction is present as free Pb(2+), whereas lead phosphate and lead bile complexes are important fractions. The lead phosphate complexes appear to be voltammetrically labile, i.e., in dynamic equilibrium with Pb(2+). Labile complexes can dissociate and the produced metal ions can subsequently be transported across the intestinal epithelium. Lead bile complexes may behave in a similar manner, or this organometal complex may be able to traverse the intestinal membrane. Therefore, substantially more than only the free metal ion should be considered available for transport across the intestinal epithelium.

Related Materials

Product #



Molecular Formula

Add to Cart

Lead hydrogen phosphate, 98%