Reference materials for inorganic component analysis of corn flour

I. Overview

The processing matrix of this series of standard materials has not been artificially added in any form. Raw materials are screened, impurities are removedDry, coarse, fine, over 60 Mix well with a sieve, and after packaging, use 60CoSterilization. See sample informationwatch 1.

watch 1 Candidate sample situation

2、 Expected use

This standard substance can meet the routine monitoring of agricultural product quality and safety, as well as the risk of heavy metal pollution in agricultural productsRisk assessment, etcJob requirements include quality control for inorganic component analysis of biological samples, calibration of laboratory analytical instruments, and analysis methodsConfirming and providing corresponding support can also be used for analyzing similar substances.

3、 Uniformity assessment and stability assessment

Uniformity assessment: random selection 30 Unit, from the bottleDifferent parts of the sample are tested 2 Repeated testingQuantitative and analytical methods ICP-MS TheICP-AES TheAFSMainly waiting, after inspection, the sample is uniform and good.

Stability assessment: investigated5 Long term stability at a certain point in time and at high temperatures（60℃）And low temperature（-18℃) Under the condition of short-term stability, the sample has been tested and found to have good stability.

Valid until 2030 year 8 The month. The research and development unit will continue to track and monitorStability testing, if found within the validity periodChanges in measurement values will be promptly notified to relevant departments and users.

4、 Fixed value testing

This series of standard substances is composed of 11 Home laboratory joint calibration. Fixed value analysis methodThe method adopts inductive coupling and ionizationDaughter mass spectrometry method（ICP-MS）Inductively Coupled Plasma Spectroscopy（ICP-AES）OriginalSub fluorescence spectrumThe law（AFS）Spectrophotometric method（COL）Capacity method（VOL）Kaishi DingNitrogen method（KTN）He LiSub selective electrode method（ISE）Ion chromatography method（IC）Wait.

Elements of testing (underlined as primary testing method)）：ICP-MS：Ag TheAl TheAs TheB TheBa TheBeThe Bi TheBr TheCd TheCe TheCoTheCr TheCs TheCu TheDy TheEr TheEuTheF TheFe TheGd TheGe TheHfTheHg TheHo TheIThe La TheLi TheLu TheMn TheMo TheNa TheNb TheNd TheNi TheP ThePb ThePr TheRb TheSb TheSc TheSe TheSi TheSm The SnTheSrTheTb TheTh TheTi TheTl TheTm TheU TheV TheY TheYb TheZn；ICP-AES：Al TheB TheBa TheCa TheCrThe

CuTheFeTheKTheMgTheMnTheNa ThePThePbTheRb TheS TheSi TheSrTheTiTheZn；AFS：As TheGeTheHg TheSbThe Se；VOL：Cl TheN；KTN：N ；IC：Cl；ISE：F ；COL：F.

5、 Measurement traceability

1 The measuring instruments used have been verified or calibrated, and the calibration solutions are all national certified standard substances.

2 The selected measurement method can meet the metrological requirements of fixed value work.

3 Using certified reference materials of the same type to monitor the measurement procedure to ensure the analysis results are accurateAccurate and reliable.

6、 Recognized value and uncertainty

This standard substance is analyzed using mature and reliable analytical methods from national and industry standardsFixed value. quantityThe principle for determining values is:

1）The number of data groups shall not be less than 9 Groups with relatively good data quality,Recognized as standard value (taking arithmetic)The average value serves as the standard value）；The uncertainty is an extended uncertainty, which includes factors such ask=2.

2）Data distribution skewness; Or with high dispersion, the data set should not be less than 6 The group is recognized as a reference value (takingThe median value of the measurement data.

Summary of measurement values can be found inwatch 2.

7、 Transportation and storage conditions

1The packaging of this series of standard substances is PETPlastic bottle, packaging specifications are 30g/When distributing bottles to users,Except for yellow croaker, prawns, and scallops, all other samples can be transported by regular express delivery; For yellow croakerShrimpScallops require insulation measures such as ice packs.

2 Standard substances such as yellow croaker, prawns, and scallops should be frozen（-18℃)Save, save other samplesIt can be done under cool and dry conditions.

8、 Instructions for use

1 After opening and using this standard substance sample, immediately seal it tightly. If mold is found, stop using it.

2 This standard substance sample does not require further processing before use,Such as grinding, etc.

3 This standard substance is for laboratory use and is not edible.

4 The minimum sampling size of this series of standard substances is classified according to parameters,Recommended as follows:

9、 Cooperative fixed value unit

Hunan Geological Experimental Testing Center and Gansu Geological Mineral Exploration and Development Bureau's Third Geological MineExploration InstituteAnhui Geological Experimental Research Institute (Hefei Mineral Resources Supervision and Testing Center), Xinjiang Uygur Autonomous Region Geological Bureau Mineral Experimental Research Center, Liaoning Geological and Mineral Research Institute Co., Ltd., Hunan Mineral Resources Survey Institute Geological Experimental Testing Center, Nuclear Industry 230 Research Institute, Jiangsu Geological Survey and Research Institute, Jiangxi Nonferrous Geological and Mineral Exploration and Development Institute Experimental Testing Center, Tianjin Geological and Mineral Testing Center, AgriculturalEnvironmental Quality Inspection and Testing Center of the Ministry of Industry and Rural Affairs (Tianjin).

continued table 2 26 Quantity table of standard substances

note：（） The internal values are reference values. belt*The unit of data content for the number is g/kg.