The Seal Analytical AQ2 utilizes EPA Approved Methods

AQ2 - USEPA Approved Methods

ENVIRONMENTAL METHODS LIST
USEPA Rev 19 Method Detection Limits are calculated using USEPA procedure 40 CFR, Part 136, Appendix B

ANALYTE

METHOD DESCRIPTION

METHOD NUMBER

METHOD DETECTION LIMIT

EQUIVALENCE

ALKALINITY

Buffered methyl orange color reduction

EPA-100-A Rev 3

EPA-101-A Rev 2

EPA-102-A Rev 3

6.5 mg CaCO₃ /L (Range: 10 to 100 mg/L)

8 mg CaCO₃ /L (Range: 15 to 200 mg/L)

16 mg CaCO₃ /L (Range: 50 to 500 mg/L)

EPA 310.2

AMMONIA

Alkaline phenate method with hypochlorite and sodium nitroprusside (indophenol blue)

EPA-103-A Rev 6

EPA-129-A Rev 5

0.007 mg N/L (Range: 0.02 to 2.0 mg N/L)

0.05 mg N/L (Range: 0.2 to 10 mg N/L)

EPA 350.1, version 2 (1993)
Std. Methods 4500-NH₃ G (19^th,20^th)

AMMONIA

Alkaline phenate method with hypochlorite and sodium nitroprusside (indophenol blue). This is a brackish method.

EPA-104-A Rev 3

0.02 mg N/L (Range: 0.05 to 2.0 mg N/L)

EPA 350.1, version 2 (1993)
Std. Methods 4500-NH₃ G (19^th,20^th)

CHLORIDE

Mercuric thiocyanate reaction in the presence of ferric nitrate

EPA-105-A Rev 5

EPA-124-A Rev 5

0.3 mg/L (Range: 2 to 100 mg/L)

0.4 mg/L (Range: 5 to 200 mg/L)

Std. Methods
4500-Cl- E (18^th,19^th,20^th)

CHROMIUM, Hexavalent

Colorimetric

EPA-108-A Rev 2

EPA-109-A Rev 2

0.001 mg/L (Range: 0.025 to 0.5 mg Cr(VI)/L)

0.011 mg/L (Range: 0.3 to 5.0 mg Cr(VI)/L)

Std, Methods
3500-Cr B (20^th)

COLOR

Platinum-cobalt standard comparison

EPA-140-A Rev 1

2 Color Units (Range: 5 to 150 Color Units)

Std. Methods
2120 B (18th,
19^th, 20^th)

CYANIDE

Chloramine-T with pyridine barbituric acid color reaction
(Manual distillation required

EPA-107-A Rev 6

0.0004 mg CN/L (Range:0.002 to 0.3 mg CN/L)

Std. Methods
4500-CN E (18^th,19^th,20^th)

CYANIDE

Chloramine-T with pyridine barbituric acid color reaction
(Manual distillation required)

EPA-130-A Rev 4

0.0005 mg CN/L (Range:0.003 to 0.25 mg CN/L)

EPA 335.4, Ver 1 (1993) Std. Methods
4500-CN E (18^th, 19^th,20^th)

CYANIDE

Amenable to chlorination
(Without distillation)

EPA-133-A Rev 1

0.0004 mg CN/L (Range:0.002 to 0.3 mg CN/L)

Std. Methods 4500-CN H (20^th)