Proficiency test AQA 20-02 Metals, Nutrients and Exchangeable Bases in Soil

S1

30 g

dried soil
acid extractable
elements

As

1-50

FOR NATIONAL

PARTICIPANTS

Any single

sample

$500

Any two
samples

$690

All three
samples

$890

FOR INTERNATIONAL

PARTICIPANTS

Any single

sample

$680

Any two
 samples

$920

All three
 samples

$1030

Be

1-50

Cd

0.5-25

Cr

5-500

Cu

2-100

Hg

0.2-5

Mn

50-1000

Mo

25-500

Ni

5-500

Pb

2-200

Sb

25-750

Se

2-50

Sn

10-200

V

20-500

Zn

10-300

S2

30 g

moist soil
acid extractable
elements

Ag

5-150

As

1-50

Al

500-15000

B

5-150

Ba

5-150

Bi

0.5-10

Co

5-150

Cs

1-20

La

5-150

Li

5-150

Mn

50-1000

Rb

5-50

Se

2-50

Sn

10-250

Tl

0.5-10

U

5-150 

Zn

50-1000

Moisture Content (%)

5-30%

S3

75 g
 agricultural soil
 

Ba, Ca, Fe, K, Mg, Na, P, S, Sr
(acid extractable)

NA

P (total)

NA

Exchangeable bases (Ca2+, Mg2+, Na+, K+) -
1M NH4Cl extract1

>0.05

Calcium chloride-extractable B2

NA

Colwell K, Colwell P

NA

P buffer index (with Colwell P)-PBI+ColP3

NA

Total Carbon, Total Organic Carbon

NA

Total Nitrogen

NA

pH of 1:5 soil/0.01M CaCl2, EC

NA