Reference material for tin element in polyvinyl chloride plastics for X-ray fluorescence analysis

Reference material for tin element in polyvinyl chloride plastics for X-ray fluorescence analysisThis series of standard substances is specifically designed forplasticmiddletinDeveloped based on element specific limit indicators and daily sample content requirements, includingRMX-H006~RMX-H010fiveA concentration level accompanied by a blank sample of the substrate（tinContent ＜10mg/kg）This standard substance can be used forXfluorescence spectrumceremony（XRF）Establish in analysisPolymers such as plasticsIn the sampletinElement analysis calibration curve, quality control during sample screening process, and determination of sample qualification inspection, etc.

Onesample preparation

This standard substance adoptsgatherChloroethyl chlorideEne（PVC）plasticAs a matrix, the diffusion agent, stabilizer, andContaining tin elementThe target substance is mixed uniformly in a high-speed mixing equipment according to a mature and stable process ratio. Through special homogenization methods, the material is melted, sheared, refluxed, and transported under strict temperature and vacuum conditions in each section of the high-speed mixing equipment to achieve good dispersibility and plasticization. Strictly control the traction speed and cutter clearance to ensurePVCUniform particle preparationObtain granular products that meet the requirementsInitial inspectionAfterwards,againProcessing injection moldingFor sheet-like samples, packed in packaging boxes.

IICharacteristic values and uncertainties

The uncertainty assessment of the characteristic values of this standard substance mainly considers multiple factorshomelaboratoryUncertainty components introduced by joint fixed values、reference materialuniformitychecksumstabilityinspectionThe introduced uncertainty component.

IIIUniformity testing and stability assessment

Refer to national standard materialsrelatedTechnical specifications require randomly selecting standard substance samples after packaging, usingXX-ray fluorescence spectroscopy analysis method（XRF）Conduct uniformity and stability tests,And using acid microwave digestion-Inductively Coupled Plasma Emission SpectroscopyThe law（ICP-OES）Verify numerical valuesThe results indicate that the series of standard materials have good uniformity and stability. The validity period of this standard substance is from the date of self determination3Year. The research and development unit will continue to track and test the stability of the standard substance. If the value changes within the validity period, the user will be notified in a timely manner.

4Traceability and value determination methods

Multiple standard materials are usedhomeJoint fixed value method for assignmentThe fixed value method includesXX-ray fluorescence spectroscopy analysis method（XRF）、Acid microwave digestion-Inductively Coupled Plasma Emission SpectroscopyThe law（ICP-OES）. By using measurement methods and instruments that meet the requirements of metrological characteristics, the traceability of characteristic values of standard substances is ensured.

FivePackaging, Storage, and Use

Reference material for tin element in polyvinyl chloride plastics for X-ray fluorescence analysisEach set of this standard substance6pieceincluding5A sheet-like standard substance with a certain level of content and1A blank sheet-like sample, with a size of diameter25mmThickness5mm.