Table 1 The effect of storing samples at –20 °C for seven years on measured sample [SRP] with and without sample acidification.

From: A global ocean dissolved organic phosphorus concentration database (DOPv2021)

Sample

[SRP] (µM)

Measured at sea

Frozen 7 years, unacidified

Frozen 7 years, 30 min acidified to pH < 2

Frozen 7 years, overnight acidified to pH < 2

ETSP-2500 m

2.91

2.11

2.86

2.86

ETSP-2000 m

3.04

2.79

2.89

2.91

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