Isotopic Tracing of Perchlorate Sources in the Environment

Figure 2

δ³⁷Cl (‰) versus δ¹⁸O (‰) values (upper diagram) and Δ¹⁷O (‰) versus δ¹⁸O (‰) values (middle diagram) for samples of synthetic ClO₄⁻, Atacama ClO₄⁻, and southwest ClO₄⁻. Southwest ClO₄⁻ is subdivided into southern SHP and DV [31, 32, 34]. ³⁶Cl/Cl versus δ³⁷Cl (‰) values (bottom diagram) for samples of synthetic ClO₄⁻, Atacama ClO₄⁻, and Southwest ClO₄⁻ [42]. The colored points represent the isotope value of some analytical reagents and firework samples measured by the authors (purple points: KClO₄, CsClO₄, NaClO₄, RbClO₄, and Mg(ClO₄)₂ and blue points: firework samples).