Table 3.

Determination of PO₄^3– at UV–visible spectrophotometer and Mo_xO_y/PDAAQ/GC electrode.

	Sample type	Salinity/psu	Founded by UV–visible spectrophotometer  ± σa (µM)	Founded by MoxOy/PDAAQ/GC ± σ (nb = 5) (µM)	Recovery % vs. UV–visible spectrophotometer (%)
1	Mediterranean Sea sample 1	47.7	0.026 ± 0.005	0.0248 ± 0.004	95.4
2	Mediterranean Sea sample 2	52.3	0.025 ± 0.005	0.024 ± 0.005	94.5
3	Kanso CRMc CG	34.338	1.70 ± 0.0011	1.67 ± 0.174	98.23
4	Kanso CRM CI	35.654	0.948 ± 0.002	1.006 ± 0.02	106
5	Kanso CRM CH	34.991	1.172 ± 0.0016	1.144 ± 0.018	97.6

^aσ standard deviation, ^bn number of analyses, ^cCRM certified reference material.