Abstract
Abstract Analytical technique on oxygen isotope composition of phosphate in soil plays an important role in biogeochemical research. As the composition of the soil is complex with multiple oxygen sources, a liable phosphate enrichment and purification technology is important for phosphate oxygen isotope research. Here we present a protocol on the analysis of the δ 18 O p of inorganic phosphate in soil, wherein phosphate was purified with multiple mineral precipitations and finally precipitated as Ag 3 PO 4 . The efficiency of NH 4 OH purification method was examined and the purity of the product was verified through XRD and element analysis. The result showed that the treatment of Ag 3 PO 4 sample by recrystallizing with ammonia could remove the impurity efficiently without significantly modify oxygen isotope compositions. The validity of sample processing and the reliability of isotope analyses were confirmed by processing a KH 2 PO 4 stand in parallel with soil samples containing phosphate. The analysis result of three types of soil samples indicated that this method provided good precision of 0.2‰. There were significant differences of δ 18 O p among three types of soil (from 15.2‰ to 19.5‰), and δ 18 O p could be used to trace P sources.
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