AQA 23-18 and AQA 23-19 river and sea water characteristics

AQA 23-18
S1

100 mL

River water

preserved in
 2% HNO₃ (v/m),
 0.01% HCl (v/m)
for
dissolved elements

Ag

0.2-5

TBA

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 23-18
S2

100 mL

Sea water
preserved in
 2% HNO₃ (v/m)

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 23-19
S1

400 mL

Frozen sea water

mg/L

Ammonia-N, Nitrate-N

<0.5

Chloride, Fluoride, Sulphate

TBA

Dissolved Organic Carbon (dNPOC)

<5

Orthophosphate-P (FRP)

<0.5

Total Dissolved Nitrogen  

<0.5

Total Dissolved Phosphorus

<0.5

AQA 23-19
S2

400 mL

Frozen river water

Ammonia-N, (Nitrate-N +Nitrite-N)

<1

Bromide, Chloride, Sulphate

TBA

Dissolved Organic Carbon (dNPOC)

<25

Orthophosphate-P (FRP)

<0.5

Total Dissolved Nitrogen 

<1

Total Dissolved Phosphorus

<0.5

AQA 23-19
S3

400 mL

Chilled river water

B, Ca, K, Mg, Na, P, Silica (as SiO₂)

TBA

Alkalinity to pH 4.5 as CaCO₃

<500

Colour, apparent (Pt-Co units)

<50

Total Hardness (CaCO₃)

<500

pH (at 25°C), EC (at 25°C) (µS/cm)

TBA

AQA 23-19 S4

400 mL

Frozen river water

Total Kjeldahl Nitrogen, Total Nitrogen

<5

Total Organic Carbon (as NPOC)

<25