ESPM 131 Lecture Notes - Lecture 26: Inositol Phosphate, Vivianite, Apatite
14 May 2018
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Lecture 26: Phosphorous
●Importance: DNA/RNA, ATP, phospholipids
●Pools:
○Organic :
■Microbial
■Plant/manure: main storage in plants is phytic acid ( inositol phosphate)
■Soil/humus content ranges 30-50%, highest in surface soils
○Inorganic :
■Primary minerals (apatite) : from weathering
■Mineral surfaces : P sorbes to (clays, Fe and Al oxid)
■Secondary compounds (CaP, FeP, MaP, AlP)
■Soluble inorganic P:
●Orthophosphate:
○H2PO4 and HPO4
○Very low concentrations due to precip/adsorption
■Insoluble inorganic P:
●rocks/fertil
●Apatite : CaPO4X, predominant in alkaline soils, in teeth
●Strengite/variscite : FePO4/AlPO4, acid soils
●Vivianite : in reducing freshwater sediments
●Hills and valleys of P fixation : liming acid soils increases P availability →
SUPER pH dependent, best availability at neutral pH
○Atmospheric deposition (dust)
○Leaching : usually minor, but leaves over long time pds
●Mineralization : org → inorg P (phosphate)
○Phosphatases
○Controlled by C/P
○Favored by:
■Inadequate P
■Warm T
■Good aeration
■Adequate moisture
■Neutral to alkaline soil
●Immobilization : inorg p → org P
○Microbes don’t reduce P when incorp into biomass
○Controlled by C/P
●C/P <200 → mineralization , C/P >300 → immobilization
●Redox rxns:
○Microbial transfer generally doesn’t alter ox state
○Usually not less than +5 (PO4 3-)
○FiPS-3 can grow by anaerobic ox of phosphite to phosphate (uncommon)
○Under high redox cond, may be reducing (ruminate intestines)
○diphosphane/phosphine → explanation for how methane could be spontaneously ignited
Document Summary
Plant/manu(cid:418)e: main sto(cid:418)a(cid:322)e in plants is ph(cid:482)ti(cid:283) a(cid:283)id (cid:1827) inositol phosphate(cid:1828) Soil/humus (cid:283)ontent (cid:418)an(cid:322)es (cid:1682)(cid:1679)-(cid:1684)(cid:1679)%, hi(cid:322)hest in su(cid:418)(cid:321)a(cid:283)e soils. Mineral sur(cid:321)a(cid:283)es : p so(cid:418)(cid:282)es to (cid:1827)(cid:283)la(cid:482)s, fe and al o(cid:481)id(cid:1828) Apatite : capo(cid:1683)x, p(cid:418)edominant in alkaline soils, in teeth. Hills and valle(cid:482)s o(cid:321) p (cid:481)ation : limin(cid:322) a(cid:283)id soils in(cid:283)(cid:418)eases p a(cid:475)aila(cid:282)ilit(cid:482) . Super ph dependent, (cid:282)est a(cid:475)aila(cid:282)ilit(cid:482) at neut(cid:418)al ph. Mineralization : o(cid:418)(cid:322) ino(cid:418)(cid:322) p (cid:1827)phosphate(cid:1828) Immo(cid:282)ilization : ino(cid:418)(cid:322) p o(cid:418)(cid:322) p. Mi(cid:283)(cid:418)o(cid:282)es don"t (cid:418)edu(cid:283)e p (cid:476)hen in(cid:283)o(cid:418)p into (cid:282)iomass. C/p (cid:1682)(cid:1679)(cid:1679) immo(cid:282)ilization. Mi(cid:283)(cid:418)o(cid:282)ial t(cid:418)ans(cid:321)e(cid:418) (cid:322)ene(cid:418)all(cid:482) doesn"t alte(cid:418) o(cid:481) state. Usuall(cid:482) not less than +(cid:1684) (cid:1827)po(cid:1683) (cid:1682)-(cid:1828) Fips-3 (cid:283)an (cid:322)(cid:418)o(cid:476) (cid:282)(cid:482) anae(cid:418)o(cid:282)i(cid:283) o(cid:481) o(cid:321) phosphite to phosphate (cid:1827)un(cid:283)ommon(cid:1828) Unde(cid:418) hi(cid:322)h (cid:418)edo(cid:481) (cid:283)ond, ma(cid:482) (cid:282)e (cid:418)edu(cid:283)in(cid:322) (cid:1827)(cid:418)uminate intestines(cid:1828) Diphosphane/phosphine e(cid:481)planation (cid:321)o(cid:418) ho(cid:476) methane (cid:283)ould (cid:282)e spontaneousl(cid:482) i(cid:322)nited. Dissol(cid:475)ed p al(cid:476)a(cid:482)s lo(cid:476), (cid:283)(cid:418)ops (cid:418)e(cid:417) a lot. Pu(cid:418)e (cid:283)ultu(cid:418)es o(cid:321) (cid:282)a(cid:283)te(cid:418)ia (cid:283)ould imp(cid:418)o(cid:475)e th(cid:418)u solu(cid:282) o(cid:321) cap.
