Environmental Analytical Instruments
Environmental Analytical Instruments
Instrument choice follows the analytical question, matrix, concentration range, required detection limit, method approval and laboratory capability.
## 1. Routine water-quality instruments | Instrument | Operating principle | Typical application | Key checks | |—|—|—|—| | pH meter | Electrode potential related to hydrogen-ion activity | pH | Buffer calibration, electrode condition, temperature | | Conductivity meter | Electrical conductance through a solution | EC and salinity indication | Cell constant and conductivity standard | | Turbidimeter | Light scattering by particles | Turbidity | Standards, cell cleanliness and bubbles | | DO meter | Optical or electrochemical oxygen sensing | Dissolved oxygen | Probe calibration and membrane/sensor condition | | Analytical balance | Electromagnetic force compensation or related weighing principle | Gravimetric tests | Level, zero, check weights and draft control | | UV-Vis spectrophotometer | Absorbance of light at selected wavelengths | Colorimetric analytes | Wavelength, photometric checks, blanks and calibration |
## 2. Advanced analytical instruments | Instrument | Principle | Environmental applications | |—|—|—| | AAS | Atomic absorption | Selected metals | | ICP-OES | Plasma optical emission | Multi-element metals | | ICP-MS | Mass spectrometry of plasma-generated ions | Trace and ultra-trace elements | | Ion chromatograph | Separation on ion-exchange columns with conductivity or other detection | Anions and cations | | TOC analyzer | Oxidation of organic carbon and measurement of generated CO₂ | Total organic carbon | | GC-MS | Gas chromatography separation with mass-spectrometric detection | Selected volatile/semi-volatile organics | | HPLC | Liquid chromatographic separation with suitable detector | Selected organic compounds |
## 3. Instrument lifecycle Select an approved method, confirm installation and operating conditions, qualify the instrument where required, calibrate, verify performance, maintain, document downtime and review performance trends.
## 4. Instrument record Maintain instrument ID, manufacturer/model, location, method association, calibration status, maintenance history, reference standards, verification results, operator training and out-of-service events.
## 5. Selection cautions Not every instrument is suitable for every matrix or concentration range. Detection capability, interferences, sample preparation, consumables, maintenance, operator competence and method approval all affect fitness for purpose.