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Home > Applications > Environmental Monitoring > Air & Water Quality Analysis

Air & Water Quality Analysis

Optical spectroscopy techniques are ideal for air and water quality monitoring, where chemical, biological and other parameters can be measured in situ with portable, flexible and robust UV-Vis and NIR spectrometers available from Ocean Optics.

We collaborate with customers on air and water quality monitoring applications by providing spectrometers, accessories, sub-systems and complete solutions. Our customers have monitored air quality in areas affected by the Deepwater Horizon oil spill, developed a handheld water quality system to measure the interaction of sunlight with surface water constituents, and detected air pollutants in the exhaust systems of vehicles.


Featured:

Flame Spectrometer

 

The Next Generation of Miniature Spectrometers

This versatile spectrometer can be configured for applications such as open-path air monitoring and water quality analysis.

Example Setup: Absorbance of Gases

Overview

Absorbance measurements are used to quantify the concentration of solutions and gases (as described in this setup) that absorb light in a media that transmits light. The signal in absorbance units is proportional to the molar absorptivity, pathlength and concentration of the sample (see Beer’s Law).

Spectrometer

In a system configured to measure the absorbance of a gas with distinct deep UV absorption characteristics — benzene, for example, which is found in vehicle and other atmospheric emissions — a good place to start is a Maya2000 Pro, which has great response <300 nm. In this setup, the spectrometer uses an H7 grating set for the 200-300 nm wavelength range. Optical bench accessories include a detector collection lens for increased throughput and an optical bench optimized to transmit UV light. With a 5 µm slit, optical resolution of ~0.07 nm (FWHM) is possible. Our D-2000 deuterium light source is a good option for UV measurements.

There are many spectrometer-light source combinations available for measuring gas absorbance. For high resolution and faster integration times, the HR2000+ES is a good option. Also, a light source such as the DH-2000-BAL will allow you to illuminate across the UV-NIR range.

Sampling Optics

A 10-cm pathlength CUV-UV-10 cuvette holder, a CV-Q-10 cylindrical quartz cell and a pair of 455 µm extreme solarization-resistant optical fibers (one fiber illuminates, the other reads signal) comprise the system’s sampling optics. For applications requiring shorter pathlengths or open-air monitoring, use an optical fibers-with-collimating lenses or fibers-with-Gershun tube configuration.

Also Notable

The Maya2000 Pro has response <200 nm, but its configuration for VUV applications requires special attention to the optical bench components specified, as well as purge accessories and the use of free space versus fiber-coupled sampling. Nitrogen purging of the optical bench is necessary to help mitigate water and oxygen absorption that occurs in the vacuum UV. Contact an Application Sales Engineer for assistance.

Gas Absorbance System Components

Maya2000 Pro This high-resolution spectrometer is configured for UV absorbance in the sample setup.We use Grating #H7 set for 200-300 nm, with a 5 µm slit as entrance aperture and a detector collection lens for increased sensitivity.
D-2000 Deuterium source produces continuous output from ~215-400 nm
CUV-UV-10 Cuvette holder for 10-cm pathlength cuvettes
CV-Q-100 Cylindrical quartz cell with Teflon stopper; has volume of 28.2 ml
QP455-025-XSR-BX Pair of extreme solarization-resistant patch cord assemblies, 455 µm diameter, 0.25 m length
OceanView Spectrometer operating software

Example Setup - Absorbance of Gases

Chlorophyll analysis provides important information about key parameters of water quality.

Chlorophyll analysis provides important information about key parameters of water quality.

Organic matter in seawater

Analysis of dissolved organic matter in surface waters can be useful in assessing water quality.

air and water quality analysis -- solar spectrum

Spectroscopic techniques are ideal for monitoring the interaction of solar radiation with the atmosphere.

Air & Water Quality Analysis Air & Water Quality Analysis Air & Water Quality Analysis Air & Water Quality Analysis

Monitoring Air Quality

Open-path transmission measurement of simulated vehicle emissions is the focus of this video, which underscores the value of miniature spectroscopy in bringing the instrument to the sample – in this case, the very air that we breathe.

Featured products: Maya2000 Pro spectrometer; HL-2000 tungsten halogen light source

Assessing Coral Health

Real-time monitoring of coral reefs provides scientists with important information on ocean ecosystem health. This video demonstrates the use of color measurement as an indicator of coral vitality.

Featured products: Flame spectrometer; STS-VIS (350-800 nm) spectrometer; ecoVis light source (400-2500 nm)

Water Insight – Optical OEM System

Flame Spectrometer

Flame Spectrometer

High Thermal Stability, Interchangeable Slits
FLAME-BUNDLE-FL

FLAME-BUNDLE-FL

Application-Ready System for Fluorescence
FLAME-NIR BUNDLE

FLAME-NIR BUNDLE

Diffuse Reflectance Package
JAZ Spectrometer

JAZ Spectrometer

Handheld Spectrometer for UV-Vis Measurements
FLAME-BUNDLE-ABS

FLAME-BUNDLE-ABS

Application-Ready System for Absorbance
Spark-VIS

Spark-VIS

Ultra-compact Visible Spectral Sensor
Flame-NIR Spectrometer

Flame-NIR Spectrometer

Compact NIR Instrument
USB2000+ (Custom)

USB2000+ (Custom)

Custom Configured Spectrometer for Setup Flexibility
STS Developers Kit

STS Developers Kit

Connect, Code, Create with New Sensing Tools
Maya2000 Pro (Custom)

Maya2000 Pro (Custom)

High Sensitivity Spectrometer
STS-UV

STS-UV

UV Spectral Analysis in a Tiny Footprint
USB4000 (Custom)

USB4000 (Custom)

Custom Configured for Maximum Flexibility
STS-VIS

STS-VIS

Vis Spectral Analysis in a Tiny Footprint
EMBED Spectrometer

EMBED Spectrometer

Robust, Stable Spectrometer for OEM Applications