AQA 25-13 and AQA 25-14 river and sea water characteristics

September 2025

Sample	Analytes	Approximate Conc. (µg/L)*
AQA 25-13 S1 100 mL River water preserved in 2% HNO₃ (v/w), 0.01% HCl (v/w) dissolved elements	Ag	0.2-5
	Al	2-50
	As	0.2-5
	Be	0.2-5
	Cd	0.2-5
	Co	0.2-5
	Cr	0.2-5
	Cu	1-25
	Fe	50-1000
	Hg	0.1-2.5
	Mn	1-25
	Mo	1-25
	Ni	0.2-5
	Pb	0.2-5
	Sb	0.2-5
	Se	0.2-5
	Tl	0.2-5
	V	0.2-5
	Zn	1-25
AQA 25-13 S2 100 mL Sea water preserved in 2% HNO₃(v/w) for dissolved elements	Ag	0.05-2
	Al	<25
	As	0.05-5
	Be	0.05-2
	Cd	0.05-2
	Cr	0.05-2
	Cu	0.5-10
	Fe	0.5-10
	Hg	0.010-0.05
	Mn	0.5-510
	Ni	0.05-2
	P	<150
	Pb	0.05-2
	Se	0.05-5
	Sn	0.05-5
	Tl	0.05-5
	U	0.05-5
	V	0.1-5
	Zn	0.5-10
AQA 25-13 S3 750 mL River water	TDS (dried at 180±5 ºC, mg/L), TSS and TS (dried at 103-105ºC, mg/L), Turbidity (NTU)	10-500
AQA 25-14 S1 400 mL Frozen sea water		mg/L
	Ammonia-N, Nitrate-N+Nitrite-N	<0.1
	Chloride, Fluoride, Sulphate	TBA
	Dissolved Organic Carbon (dNPOC)	<5
	Orthophosphate-P (FRP)	<0.5
	Total Dissolved Nitrogen	<0.1
	Total Dissolved Phosphorus	<0.1
AQA 25-14 S2 2x200 mL Frozen river water	B, Ca, K, Mg, Na, P, Silica (as SiO₂)	<1
	Ammonia-N, Nitrate-N, Nitrite-N	0.005-0.5
	Bromide, Chloride, Sulphate	TBA
	Dissolved Organic Carbon (dNPOC)	<25
	Orthophosphate-P (FRP)	<0.5
	Total Dissolved Nitrogen	<1
	Total Dissolved Phosphorus	<0.5
AQA 25-14 S3 2x200 mL Chilled seawater	B, Ca, K, Mg, Na, Silica (as SiO₂)	TBA
	Alkalinity to pH 4.5 as CaCO₃	<100
	Total Hardness (CaCO₃)	<10000
	pH (at 25°C), EC (at 25°C) (µS/cm)	TBA

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TBA

* As these samples are real samples, the values given are indicative, based on the range of materials used in previous rounds.

TBA = to be advised.