Testing Information
Material composition analysis is a laboratory testing service that identifies and quantifies the elemental, molecular, and phase constituents of solid, liquid, and powder samples, and ZHONGXI Testing provides this analytical service for manufacturers, research institutions, suppliers, and quality control departments across metals, polymers, ceramics, chemicals, coatings, and electronic materials. The technique set behind material composition analysis answers questions such as what elements are present, in what chemical form they exist, at what concentration levels, and how they are distributed within the material matrix.
The purpose of material composition analysis is to verify raw material conformity, diagnose product failures, support reverse engineering of unknown samples, monitor impurities and trace contaminants, and confirm that incoming or outgoing materials meet agreed specifications. Typical application fields include metallurgy and alloy production, plastic and rubber formulation control, semiconductor and electronic component manufacturing, pharmaceutical excipient verification, food contact material compliance screening, battery material development, coating and ink quality control, and environmental solids assessment. The techniques involved span spectroscopic methods such as inductively coupled plasma optical emission spectrometry (ICP-OES), inductively coupled plasma mass spectrometry (ICP-MS), X-ray fluorescence (XRF), atomic absorption spectroscopy (AAS), energy dispersive spectroscopy (EDS) coupled to scanning electron microscopy, and molecular methods such as Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, gas chromatography-mass spectrometry (GC-MS), liquid chromatography-mass spectrometry (LC-MS), nuclear magnetic resonance (NMR), and X-ray diffraction (XRD) for phase identification, together with classical wet chemistry including gravimetric and titrimetric determination, combustion infrared analysis for carbon and sulfur, and inert gas fusion for oxygen, nitrogen, and hydrogen.
A typical testing process at ZHONGXI Testing begins with sample registration and intake inspection, where sample form, quantity, and history are recorded. Sample preparation then follows: metallic samples may be ground, polished, or remelted for homogeneous coupons; powders are dried and sieved to controlled particle size; polymers may be cryo-milled or dissolved in suitable solvents; liquids are digested or diluted. For elemental quantification, acid digestion in microwave vessels or hot-block systems converts the matrix into solution for ICP-OES or ICP-MS measurement against multi-point calibration curves prepared from traceable standard solutions. For surface or localized analysis, EDS mapping on a scanning electron microscope reveals elemental distribution across a fracture face or coating cross-section. For organic composition, FTIR and Pyrolysis-GC-MS identify polymer types and additives, while GC-MS quantifies residual monomers, plasticizers, and volatile organic compounds. Core quantitative parameters reported include major element concentrations expressed in weight percent, trace element contents expressed in mg/kg, carbon and sulfur contents in the range of 0.001 to 6 weight percent by combustion infrared detection, oxygen, nitrogen, and hydrogen by inert gas fusion at ppm to percent levels, phase composition by XRD with Rietveld quantification, and functional group identification by infrared band assignment. Results are compiled into a testing report listing method, instrument, calibration range, detection limits, and measured values with measurement uncertainty where applicable.
FAQ
How long does material composition analysis take?
The standard turnaround is 7 to 15 working days after sample receipt, depending on the number of elements requested, the sample matrix, and whether digestion, pre-concentration, or repeat confirmation measurements are needed. Routine single-method screening such as an alloy check by XRF can often be reported within 7 working days, while full multi-element profiles involving ICP-MS trace work, XRD phase quantification, or organic speciation by GC-MS generally require the full 10 to 15 working day window.
How is the cost of material composition analysis determined?
Cost is determined by the number of testing items selected and the analytical methods each item requires. A single-element AAS determination, a thirty-element ICP-OES profile, and an unknown-sample identification involving FTIR plus Pyrolysis-GC-MS plus XRD each carry different method complexity, instrument time, and calibration effort, so quotations are built item by item. Engineers can provide a detailed quote once the sample type, target elements or species, expected concentration ranges, and purpose of the analysis are communicated.
Which items does material composition analysis include?
The included items depend on the product type and the applicable specification. For metallic samples the typical set covers major alloying elements, impurity elements, carbon, sulfur, phosphorus, and interstitial gases. For polymeric samples it covers base polymer identification by FTIR, filler content, additive identification, and residual monomers. For minerals, ceramics, and battery powders it covers oxide composition, phase identification by XRD, and trace impurities. Engineers select the item list based on the declared material category and the conformity or diagnostic objective of the client.
How much sample should be prepared for material composition analysis?
A general guideline is 100 to 500 grams for powders, chips, or granules and 50 to 200 grams for solid pieces, which covers digestion replicate analysis, instrument calibration checks, and possible repeat measurements. For destructive elemental analysis a minimum of 5 to 10 grams is workable, while unknown-sample identification of a contaminant particle can proceed with sub-milligram amounts using microscopy-coupled methods. Samples should be kept clean, dry, and free of surface coatings or oils unless those layers are themselves the target of the analysis.
material composition analysis Testing Items
- Inductively coupled plasma mass spectrometer (ICP-MS), used for ultra-trace element determination at ug/kg levels and isotope ratio measurement.
- X-ray fluorescence spectrometer (XRF), used for non-destructive elemental screening of alloys, ceramics, and minerals from sodium to uranium.
- Atomic absorption spectrophotometer (AAS) with flame and graphite furnace atomization, used for single-element determination of trace metals.
- Carbon and sulfur infrared analyzer, used for combustion-based determination of C and S in metals, ores, and carbides.
- Oxygen, nitrogen, and hydrogen analyzer, used for inert gas fusion measurement of interstitial gases in metallic samples.
- Scanning electron microscope with energy dispersive spectrometer (SEM-EDS), used for morphology imaging and localized elemental analysis of particles, coatings, and fracture surfaces.
- Electron probe microanalyzer (EPMA), used for quantitative point analysis and element mapping with micrometer spatial resolution.
- X-ray diffractometer (XRD), used for crystalline phase identification and Rietveld quantitative phase analysis.
- Fourier transform infrared spectrometer (FTIR) with ATR accessory, used for rapid identification of polymers, rubbers, coatings, and organic contaminants.
- Raman spectrometer, used for non-destructive identification of carbon materials, pigments, and inorganic phases.
- Gas chromatograph-mass spectrometer (GC-MS), used for separation and identification of volatile organics, solvents, and pyrolysis fragments.
- Liquid chromatograph-mass spectrometer (LC-MS) and HPLC systems, used for additive, monomer, and organic species quantification in solution.
- Ion chromatograph (IC), used for anion and cation determination in extracted liquids and process waters.
- Thermogravimetric analyzer (TGA), used for filler, volatile, and ash fraction determination through controlled weight-loss curves.
- Differential scanning calorimeter (DSC), used to support composition conclusions through melting point, crystallinity, and transition behavior.
- Nuclear magnetic resonance spectrometer (NMR), used for structural confirmation of organic compounds and polymer end-group analysis.
- X-ray photoelectron spectrometer (XPS), used for surface layer elemental composition and chemical state analysis at nanometer depth.
- Microwave digestion and hot-block digesters, used for closed-vessel matrix dissolution prior to solution-based instrumental analysis.
- Glow discharge spectrometer (GDS), used for depth profiling of galvanized and treated surfaces layer by layer.
Summary
Material composition analysis at ZHONGXI Testing covers elemental quantification by ICP-OES, ICP-MS, XRF, AAS, and combustion analysis, molecular and additive identification by FTIR, GC-MS, LC-MS, and NMR, and phase analysis by XRD, applied to metals, polymers, ceramics, battery materials, coatings, chemicals, and unknown samples. Typical turnaround ranges from 7 to 15 working days depending on the selected items and sample matrix, and engineers provide item-by-item quotations based on the sample type and analytical objective.