ASTM D7536 Dispersive X-ray Fluorescence Spectrometry
The ASTM D7536 test technique covers the estimation of chlorine by monochromatic, frequency dispersive X-beam fluorescence (MWDXRF) spectrometry in sweet-smelling hydrocarbons, their subsidiaries, and related synthetic substances. The qualities 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 D7536 is a standardized, non-destructive test method for determining chlorine content in aromatic hydrocarbons and related synthetic materials using monochromatic wavelength-dispersive X-ray fluorescence spectrometry (MWDXRF).
With little sample preparation, this sophisticated analytical method offers precise chlorine determination. The technique is widely used in industrial settings and labs where quick, accurate chlorine detection is crucial. The test aids quality control and regulatory compliance in the chemical industry, and results are expressed in SI units.
Scope, Applications, and Benefits
Scope
ASTM D7536 evaluates:
- Chlorine concentration in aromatic hydrocarbons
- Trace-level chlorine detection (up to 10 mg/kg)
- Samples with minimal preparation
- Diluted samples for higher chlorine concentrations
- Detection limits down to 0.2 mg/kg
- Quantitation limits of 0.7 mg/kg
This method allows testing of samples such as benzene, toluene, and xylene under controlled laboratory conditions.
Applications
- Petrochemical processing
- Solvent quality assessment
- Chemical manufacturing
- Aromatic hydrocarbon analysis
- Regulatory compliance testing
- Research laboratories
- Environmental monitoring
- Quality assurance programs
Benefits
- Non-destructive analysis
- Minimal sample preparation
- High sensitivity and accuracy
- Rapid testing (5–10 minutes per sample)
- Low detection limits
- Improved signal-to-noise ratio
- Suitable for routine laboratory testing
Test Process
Sample Preparation & Excitation
The sample is placed in the XRF cell and excited using a monochromatic X-ray beam.
1Fluorescence Detection
Emitted chlorine Kα radiation is collected by the analyzer.
2Signal Measurement & Calibration
X-ray intensity is measured and converted to concentration using a calibration curve.
3Data Processing
Chlorine concentration is calculated in mg/kg.
4Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Aromatic hydrocarbons (benzene, toluene, xylene) |
| Concentration Range | Up to 10 mg/kg |
| Detection Limit | 0.2 mg/kg |
| Quantitation Limit | 0.7 mg/kg |
| Analysis Time | 5–10 minutes |
Instrumentation Used for Testing
- Monochromatic WDXRF spectrometer
- Sample cells
- Precision balance
- Calibration standards
- Data processing software
- X-ray detector system
Results and Deliverables
- Chlorine concentration values (mg/kg)
- Calibration reports
- Analytical reports
- Compliance reports
- Trend analysis data
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Read Case StudyFrequently Asked Questions
Dispersive XRF measures the fluorescence emitted by a material when it is excited by X-rays. The emitted X-rays are detected and analyzed to determine the elemental composition.
When an atom absorbs energy, its outer electrons move to fill inner electron shells. As the atom returns to its normal state, it emits X-ray fluorescence radiation. This process happens without touching or damaging the sample. The emitted radiation is unique to each element, much like a fingerprint, which helps identify the elements in the sample.
It helps to determine the chemical composition of various materials, including solids, liquids, slurries, and loose powders.
It cannot measure the beryllium content and is expensive and complex.
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