Table 2 Estimates of phosphite and phosphate concentrations (µM) in surface ocean

Locations	Scenario 1		Scenario 2a/2b		Scenario 3		Scenario 4a/4b
	1. P species ratio in BIF is same as in EDTA-NaOH extract 2. Metamorphic phosphite is none		1. P species ratio in BIF is same as in EDTA-NaOH extract 2. Metamorphic phosphite using exp. yield		1. 100% phosphite is extracted from BIF 2. Metamorphic phosphite is none		1. 100% phosphite is extracted from BIF 2. Metamorphic phosphite using exp. yield
	P(III)	P(V)	P(III)	P(V)	P(III)	P(V)	P(III)	P(V)
Kuruman-Gamohaan	0.024–0.075	0.013–0.352	0.000*–0.054^a	0.014–0.354^a	0.001–0.002	0.016–0.354	ENP^a	0.016–0.354^a
Kuruman-Gamohaan	0.024–0.075	0.013–0.352	0.024–0.075^b	0.013–0.352^b	0.001–0.002	0.016–0.354	0.001–0.002^b	0.016–0.354^b
Joffre	0.000*–0.002	0.005–0.029	0.000^a*	0.005–0.029^a	0.000*	0.005–0.012	ENP^a	0.005–0.012^a
Joffre	0.000*–0.002	0.005–0.029	0.000*–0.001^b	0.005–0.029^b	0.000*	0.005–0.012	0.000*^b	0.005–0.029^b
Dales Gorge	0.017–0.142	0.002–0.921	0.000*–0.020^a	0.003–0.927^a	0.001–0.002	0.004–0.927	ENP^a	0.003–0.927^a
Dales Gorge	0.017–0.142	0.002–0.921	0.017–0.142^b	0.002–0.921^b	0.001–0.002	0.004–0.927	0.001*–0.002^b	0.003–0.927^b
Marra Mamba	0.058–0.165	0.024–0.300	0.000*–0.033^a	0.025–0.307^a	0.001–0.002	0.027–0.307	ENP^a	0.027-0.307^a
Marra Mamba	0.058–0.165	0.024–0.300	0.058–0.165^b	0.024–0.300^b	0.001–0.002	0.027–0.307	0.001–0.002^b	0.027–0.307^b

^aScenario 2a/4a- Experimental yield of Herschy et al.⁹; ^bScenario 2b/4b- Experimental yield of Baidya et al.¹⁷; exp experimental, BIF banded iron formation, ENP estimation not possible (all phosphite are metamorphic like Scenario 5); *: values 0.000 means the concentration is less than 0.5 nM.

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