Available and total phosphorus background levels in soils: a calcareous and semi-arid region

Jalali, Mohsen; Jalali, Mahdi; Beygi, Mohsen; Salehi, Zahra; Antoniadis, Vasileios

doi:10.1007/s10661-023-11175-z

Cited by 4 publications

(1 citation statement)

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“…Phosphorus (P) is an essential element for growth and energy transport for all living organisms and is often the limiting nutrient for primary production in terrestrial and aquatic ecosystems (Worsfold et al 2020). P content in agricultural soils needs to be assessed from agronomic and environmental standpoints (Mohsen Jalali et al 2023). Current agricultural practices signi cantly impacts on water quality due to P losses to water bodies (Haygarth et al 2014), higher P content in natural water leads to eutrophication (Withers et al 2014), harmful algal blooms (Moreno-Bondi et al 2022), oxygen depletion and mortality of biota.…”

Section: Introductionmentioning

confidence: 99%

Field method for determination of available phosphorus in soil by selective formation of protonated crystal violet dimer:12-molybdophosphoric acid [(R)22+ H + -12MPA] complex

Thangavel,

Rastogi,

Venkateswarlu

et al. 2023

Preprint

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Phosphorus (P) is an important nutrient for agricultural soil and it accelerates eutrophication in environmental water. In aqueous medium, sensitive method for P determination by ion-pair (IP) of triphenylmethane (TPM) dyes with 12-molybdophosphoric acid (12-MPA) is hampered due to multiple IP complexes, overlapping of IP spectrum with unassociated dye and potential interference from silicate. 12-MPA (H3PMo12O40) ion associate with monovalent and protonated crystal violet ions [R+, R+H+, R+(H)22+] forming R+-H2PMo12O40 (violet), R+H+-HPMo12O40 (bluish green) and R+(H)22+-PMo12O40 (yellow) complexes with λmax at ~ 590, 610 and 450 nm respectively. In this developed method, R+H+ of R+H+-HPMo12O40, aggregate to dimerization induced by complexing ion (HPMo12O402−) forms (R)22+ H+.PMo12O40 (blue, 560 nm). This ion-pair complex is selectively utilized for visual detection of phosphorus. No dimer formation of unassociated R+H+ and disappearance of shoulder of characteristic CV absorption spectrum remove spectral overlap at 560 nm. R+H+ at 610 nm, double protonated R+(H)22+ and its IP complex [R+(H)22+.PMo12O40] at ~ 450 nm don’t interfere in the analysis. Rapid formation of (R)22+H+- PMo12O40 and double protonation of R+H+ into R+(H)22+ on interaction with sample solution containing molybdate ion removes silicate interference. This method is successfully applied for agricultural soil for determination of available P in Olsen, Morgan, Mehlich, Bray and Acetic acid extraction procedures. The results obtained by the developed method are validated by ion-chromatography (IC). Five distinct colour formation for 0, 0.25, 0.5, 1.0 and 2.0 mg/L of P offers infield screening of agricultural soil as low, medium, high and very high available P for fertilizer management.

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Section: Introductionmentioning

confidence: 99%