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- Title
Potassium isotopes of fertilizers as potential markers of anthropogenic input in ecosystems.
- Authors
Qu, Rui; Han, Guilin
- Abstract
Potassium (K)-containing fertilizers are widely applied in agriculture to improve plant growth, yet fertilizer overuse induce pollution of waters, calling for methods to trace the sources of K. K isotope compositions in ecosystems could potentially indicate the source of K, yet there is actually few isotope data on fertilizer K. Here we report stable K isotope data for various fertilizer types from different countries, and we compare these values with K isotope data for plants, soil, mantle, ocean, and rivers. K isotope compositions were determined by multi-collector inductively coupled plasma mass spectrometry. δ41K values of K2SO4 fertilizers ranged from − 0.16 to 0.51‰, those of KH2PO4 fertilizers from 0.04 to 0.19‰, those of NPK fertilizers from 0.04 to 0.22‰, and those of NK fertilizers from 0.16 to 0.23‰. There is a considerable variation in the K isotope compositions by fertilizer types but limited variation by countries, suggesting these data could be reference materials worldwide. Comparison with other K sources shows that, in some cases, K isotope ratios and concentrations could be used to identify the input of fertilizers in ecosystems.
- Subjects
POTASSIUM fertilizers; INDUCTIVELY coupled plasma mass spectrometry; STABLE isotopes
- Publication
Environmental Chemistry Letters, 2023, Vol 21, Issue 1, p41
- ISSN
1610-3653
- Publication type
Article
- DOI
10.1007/s10311-022-01516-8