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Proficiency test AQA 20-16 and AQA 20-17 Sea Water Characteristics

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Sample

Analytes

Approximate Conc. (ug/L)*

Price**
AUD $

S1 AQA 20-16

100 mL

filtered sea water
(low level)

preserved in
 2% HNO3 (v/m)

for
dissolved elements

 

Al

<25

 

TBA

 

 

 

Ag

<5

As

<5

Be

<5

Bi

<5

Cd

<5

Co

<5

Cr

<5

Cu

<15

Fe

<25

Hg

<5

Li

<5

Mn

<15

Ni

<5

P

<150

Pb

<5

Pt

<5

Se

<5

Sn

<5

Th

<5

Tl

<5

U

<5

V

<5

Zn

<5

S2 AQA 20-16

100 mL

unfiltered sea water

(high level)

preserved in
 2% HNO3 (v/m)
for
total elements

Al

<750

Ag

<50

As

<50

Ba

<100

Cd

<50

Cr

<50

Cu

<50

Fe

<200

La

<25

Mn

<50

Mo

<50

Ni

<50

P

<500

Pb

<50

Sb

<50

Se

<50

Sr

<10000

V

<100

Zn

<100

Zr

<50

S1 AQA 20-17

200 mL

filtered 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

S1 AQA 20-17

400 mL

unfiltered frozen sea water

B, Ca, K, Mg, Na, P (total)

<5

Total Kjeldahl Nitrogen, Total Nitrogen

<5

Total Organic Carbon (as NPOC)

<50

Alkalinity to pH 4.5 as CaCO3

<500

Total Hardness (CaCO3)

<5000

pH (at 25°C), EC (at 25°C)

TBA

* As these samples are real samples, the values given are indicative, based on the range of materials used in previous rounds. These ranges will be readjusted in the dispatch letter.

TBA-to be advised

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Last updated: 17 November 2020

Content ID: 66480