ASTM D7558 Colorimetric & Spectrophotometric Testing Services
ASTM D7558 is intended to evaluate how much absolute extractable gas pedals are in regular elastic-plastic (NRL) and nitrile gloves. The quantities expressed in SI units are to be viewed as standard.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D7558 describes a standard colorimetric or spectrophotometric procedure for the determination of specific analytes in chemical, industrial, or environmental matrices. Colorimetric and spectrophotometric methods quantify target analytes by measuring the intensity of a color reaction or light absorbance at a characteristic wavelength, correlating it to concentration via a calibration curve.
This standard provides a cost-effective, widely accessible analytical approach applicable to a broad range of analytes and sample types, making it valuable for routine quality control and environmental monitoring programs.
Scope, Applications, and Benefits
Scope
ASTM D7558 covers:
- Spectrophotometric measurement of specific analytes in defined matrices
- Calibration and standardization procedures for colorimetric analysis
- Interference identification and correction methods
- Method validation requirements for colorimetric procedures
Applications
- Water and wastewater quality analysis
- Industrial process stream monitoring
- Environmental sample analysis
- Chemical product quality control
- Food, beverage, and agricultural analyte testing
Benefits
- Simple, low-cost instrumentation requirements
- Widely available across routine analytical laboratories
- Applicable to multiple analytes with method-specific reagents
- Well-established calibration and QC framework
- Supports field and laboratory measurements
Test Process
Sample Preparation
Prepare the sample, blank, standards, and QC samples as required.
1Color Development
Add reagent and allow color to develop under specified conditions.
2Spectrophotometric Measurement
Measure absorbance at the characteristic wavelength using a UV-Vis spectrophotometer.
3Concentration Calculation
Calculate analyte concentration from the calibration curve; apply any required blank corrections or dilution factors.
4Technical Specifications
| Parameter | Details |
|---|---|
| Standard | ASTM D7558-09 |
| Test Principle | UV-Vis spectrophotometry / colorimetry |
| Applicable Matrices | Water, chemical solutions, industrial streams |
| Measured Output | Analyte concentration |
| Calibration | Multi-point calibration curve |
| Instrumentation | UV-Vis spectrophotometer |
Instrumentation Used for Testing
- Spectrophotometer
- Colorimeter
- Calibration standards (white/black tiles)
- Sample holders
- Light source (standard illuminant)
- Data analysis software
- Environmental control setup
Results and Deliverables
- Analyte concentration in defined units
- Calibration curve and linearity data
- QC sample recoveries and duplicate precision
- Interference assessment and correction factors
- Analytical report with uncertainty estimates
- Compliance documentation for regulatory submissions
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Frequently Asked Questions
A specific chemical reagent reacts with the analyte of interest to produce a colored compound. The intensity of the color, measured as absorbance at a characteristic wavelength, is proportional to the analyte concentration per Beer-Lambert's law.
Many analytes including ammonia, nitrate, phosphate, iron, manganese, chromium, and various organic compounds have established colorimetric methods using specific reagent chemistries.
The standard identifies known interferents and provides correction procedures, including blank subtraction, alternative wavelength measurement, or sample pre-treatment such as digestion, extraction, or pH adjustment.
Detection ranges vary widely by analyte and reagent but typically cover low ppb to percent-level concentrations. Sample dilution or concentration steps can extend the working range.
Spectrophotometric colorimetry is less sensitive and selective than ICP-OES but is significantly less expensive, simpler to operate, and suitable for routine single-analyte measurements where the highest detection limits are not required.
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