Analytical Methods as of 2004
|
ION |
INSTRUMENT |
TECHNIQUE |
|
NH4+,
PO4-3 NO3- (WC) |
Alpkem Flow Solution III |
Phenate method (NH4+)1 Phosphomolybdate method
(PO4-3)1 |
|
SO4-2, Cl-,
NO3- |
Dionex 500 DX
Ion Chromatograph |
Ion exchange
chromatography, AS4A and AG4A columns, micro-membrane supressor2 |
|
K+, Na+ |
Perkin-Elmer Aanalyst 300
Atomic Absorption Spectrometer |
Flame atomization, direct
air3 |
|
Ca+2, Mg+2,
SiO2 |
Leeman Labs Profile ICP |
Emission spectroscopy |
|
pH |
Fisher-Accumet AR20
pH/conductivity meter with Thomas glass electrode, Fisher reference probe
(precip. & stream) with Fisher Accu=pHast combination probe (AQ) |
Standardization with
Fisher 7.00 and 3.00 (precip.), 4.00 (AQ), 10.00 (stream) buffers; samples
and buffers at room temperature |
|
Specific Conductivity |
Fisher-Accumet AR20
pH/conductivity meter |
Direct reading |
|
DOC (Dissolved Organic
Carbon) |
Shimadzu TOC 5050 |
High temperature
combustion of sample; platinum catalyst C to CO2, NDIR detect. |
1 #00578 Standard Alpkem Methods (NH4+) #00580 (PO4-3), Alpkem Corp, Clakamas OR QuikChem method #10-107-065-1-J (NH4+), #10-115-01-1-M (PO4-3), 2000, Lachat Instruments, Milwaukee, WI
2 Small, H., Stevens, T.S. and Bauman, W.C. 1975. Anal. Chem. 47:1801-1809.
3 Slavin, W. Atomic absorption spectroscopy. 1968. Wiley-Interscience, New York.
WC=Wappinger Creek Stream Samples
PPT=Precipitation Samples
AQS=Low-Volume Filter Pack Samples