UV-Visible and Infrared Spectroscopic Methods in Environmental Analysis - Fundamentals of Environmental Sampling and Analysis - page 215

Table 8.6 IR methods for the analysis of pollutants in air

Pollutant IR method description EPA method

Absorption at 2165-2183 cm 1 ; Measured by CO 40 CFR 50,

nondispersive IR Appendix C

Absorption at 2342 cm 1 CO 2 -

Absorption at 1045 cm 1 O 3 (2 ppb DL, 100 m path length) -

Absorption at 1920-1870 cm 1 (4 ppb DL, 100 m path length)

NO -

Absorption at 1361 cm 1 SO 2 (2 ppb DL, 100 m path length) -

Formic acid Absorption at 1105 cm 1
VOC VOC measurement real-time by FTIR TO 16

Table 8.7 IR methods for the analysis of pollutants in water and other samples

Pollutant IR method description EPA method

Total recoverable Oil and grease from waters and wastewater. Applicable 413.2

oil and grease to the determination of hydrocarbons, vegetable oils,

animal fats, waxes, grease, and related matter.

Semivolatile GC-FTIR analysis of SVOCs. Particularly for the 8410

organics identification of specific isomers that are not

differentiated using GC/MS.

Ethers and Bis(2-chloroethy) ether and its hydrolysis compounds 8430

alcohols in aqueous matrices by direct aqueous injection

(DAI) and GC-FTIR.

TRPH a Sediment, soil, and sludge are extracted by supercritical 8440

CO 2 and then analyzed for TRPHs. Petroleum 418.1

hydrocarbons in water and wastewater.

a

TRPH, total recoverable petroleum hydrocarbons.

8.4 PRACTICAL ASPECTS OF UV-VISIBLE
AND INFRARED SPECTROMETRY

8.4.1 Common Tips for UV-Visible Spectroscopic
Analysis

The use of UV-VIS spectrometers is pretty straightforward. The needed training is
minimal compared to all other instruments. Few helpful tips to the beginners are
listed below.
Use only quartz cuvettes (sample cell) in the UV range (200-380 nm). Plastic
and disposable cuvettes are fine in the visible range (380-800 nm), but will be
melted if samples are in certain solvents such as hexane (Fig. 8.18 a, b).
Watch out different sides of the cuvette and the light path; do not hold
(scratch) the smooth sides of the cuvette. Make sure that the light passes
through the cuvette with the smooth sides.