ENVIRONMENTAL METHODS LIST – UKAS Rev 7
Method Detection Limits are calculated using NS30 protocol (WRc UK)
| ANALYTE |
METHOD DESCRIPTION |
METHOD NUMBER |
METHOD DETECTION LIMIT |
EQUIVALENCE |
| ALUMINIUM |
Pyrocatechol violet [Þ,Þ-bis(3,4-dihydroxyphenyl) toluene-2, Þ-sultone] reaction |
|
| 0.011 mg Al/L (Range: 0.025 to 1.0 mg Al/L) |
|
UK Blue Book Method |
| AMMONIA |
Salicylate method with hypochlorite and sodium nitroprusside (indophenol blue) |
| UKAS-500-A |
| UKAS-501-A |
| UKAS-502-A |
|
| 0.02 mg N/L (Range: 0.1 to 1.0 mg N/L) |
| 0.16 mg N/L (Range: 2.0 to 10 mg N/L) |
| 0.32 mg N/L (Range: 10 to 50 mg N/L) |
|
UK Blue Book Method |
| AMMONIA |
Salicylate method with hypochlorite and sodium nitroprusside (indophenol blue) This is a brackish method. |
UKAS-503-A |
0.01 mg N/L (Range: 0.025 to 0.5 mg/L)* |
UK Blue Book Method |
| CHLORIDE |
Mercuric TPTZ reaction |
|
| 0.67 mg Cl/L (Range: 10 to 100 mg Cl/L) |
| 2.69 mg Cl/L (Range: 50 to 500 mg Cl/L) |
|
UK Blue Book Method |
| IRON (II) |
Acidic 1,10-phenanthroline reaction |
UKAS-504-A |
0.004 mg Fe(II)/L (Range: 0.04 to 4.0 mg/L)* |
UK Blue Book Method |
| IRON - TOTAL |
Reduction of ferric iron followed by acidic 1,10-phenanthroline reaction |
UKAS-507-A |
0.008 mg Fe/L (Range: 0.04 – 4.0 mg Fe/L)* |
UK Blue Book Method |
| NITRITE |
Sulphanilimide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride |
|
| 0.0013 mg N/L (Range: 0.01 to 0.1 mg N/L) |
| 0.0032 mg N/L (Range: 0.2 to 2.0 mg N/L) |
|
UK Blue Book Method |
| NITRATE + NITRITE |
Hydrazine reduction followed by sulphanilamide reaction in the presence of N-(1-naphthylethylenediamine) dihydrochloride |
|
| 0.14 mg N/L (Range: up to 20 mg N/L) |
| 0.38 mg N/L (Range: up to 50 mg N/L) |
|
UK Blue Book Method |
| SILICA |
Acidic molybdate with reduction (silicomolybdenum blue) |
UKAS-514-A
|
0.002 mg Si/L (Range: 0.025 to 0.5 mg Si/L)* |
UK Blue Book Method |
| SULPHATE |
Barium chloride turbidimetric method |
UKAS-515-A
|
2.4 mg SO4/L (Range: 10 to 100 mg SO4/L) |
UK Blue Book Method |
* Method detection limit calculated using USEPA procedure 40 CFR, Part 136, Appendix B
SEAL Analytical is continually developing methods. Please note that others may exist.
If you do not see your chosen method on this list, please consult your SEAL Analytical Technical Support Team
Copyright © 2008 SEAL Analytical
Reproduction or distribution of this document is expressly forbidden without written permission from
SEAL Analytical or one of its authorized distributors