Soil standard material - floodplain sediment

Geochemical reference materials are reference standards for testing the chemical composition values of various geological materials. Mainly used for the transmission of measurement values, calibration of testing instruments, monitoring of analytical quality, evaluation of analytical methods, and laboratory certification. The geochemical reference materials play an important role in the quality control of geochemical sample analysis. Standard substances have become the basis for arbitration and evaluation of various material composition testing in economic and trade.

I. Overview
There are 7 standard substance meters for floodplain sediment in this series, mainly used for measuring values and quality monitoring standards in geological, geochemical surveys, and mineral exploration sample testing. They can also be used by environmental and other departments to analyze similar substances.
2、 Sample preparation
Sediments samples from seven river mouths or near river mouths in China's main river system were collected. After air drying, impurity removal, and coarse crushing, they were sieved through a 1mm sieve and dried at 105 ℃ for 24 hours to remove negative water and inactivate. They were then ground to -0.074mm using a high alumina ceramic ball mill, accounting for over 99%.
Number (internal number) Sampling location watershed background
GBW07385 (GSS-29) Yangtze River Basin, Xinhai Town, Chongming County, Shanghai
GBW07386 (GSS-30) Yangtze Zhou Gan River Basin, Nanchang City, Jiangxi Province
GBW07387 (GSS-31) Hanshui River Basin, Xinhe Town, Hanchuan City, Hubei Province
GBW07388 (GSS-32) Huaihe River Basin, Wuyao Village, Chuzhou City, Anhui Province
GBW07389 (GSS-33) Yellow River Basin, Songhuang Village, Binzhou City, Shandong Province
GBW07390 (GSS-34) Haihe River Basin, Yuzhuangzi Village, Tanggu District, Tianjin City
GBW07391 (GSS-35) Heilongjiang River Basin, Zhaodong City, Heilongjiang Province
3、 Uniformity and stability
Randomly select 25 bottles from the small packaging unit bottle, use X-ray fluorescence spectroscopy to perform double analysis on representative elements with different contents and properties, and use analysis of variance to test. It is proved that the sample uniformity is good, and the small sample size for analysis is 0.1g. Stability has been tested and proven to be good. Valid until 2027.
4、 Fixed value test
The main methods used in constant value analysis and the elements tested are as follows. Plasma Mass Spectrometry: Ag As Ba Be Bi Br Cl Cd Co Cr Cs Cu Ga Hf I In Li Mn Mo Nb Ni P Pb Rb Sb Sc Sn Sr Ta Te Th Ti Tl U V W Zn Zr And REE; Plasma spectroscopy: B Ba Be Co Cr Cu Li Mn Ni P Pb Sc Sr Ti V Zn Al Fe3+Mg Ca Na K; X-ray fluorescence spectroscopy: As Ba Br Ce Cl Co Cr Cu Ga Hf Mn Nb Ni P Pb Rb S Sc Sr Th Ti Y Zn Zr and main components (melting plate method); Neutron activation method: As Ba Ce Co Cr Cs Eu Hf La Lu Nd Rb Sc Sm Ta Tb Th U W Yb Zn Fe3+Na K; Flame atomic absorption method: Mn Mg Ca Na K; Atomic fluorescence method: As Bi Ge Hg Sb Se; Ion chromatography: Br Cl; Polarographic method: Mo W; Emission spectroscopy: Ag B Sn, etc; Spectral colorimetric method: I P Ti Fe3+; Capacity method: Si Al Fe3+Fe2+Mg Ca C S; Weight method: Si H2O+LOI.
5、 Recognized value and uncertainty
The standard value shall be determined based on a minimum of 6 sets of fixed value data, tested using accurate methods and with good accuracy; Data with a small number of sets (but not less than 3 sets) or accuracy that does not meet the requirements are considered as reference values and are represented by data in parentheses. The standard value uncertainty (U) is calculated using a formula, where uchar, ubb, and us are the uncertainties introduced by constant value, uniformity, and stability, respectively, and k is the inclusion factor, taken as k=2.
6、 Packaging and Storage
The sample is packaged in well sealed glass bottles, 70g/bottle, and stored in an air-conditioned room at around 25 ℃. After use, it should be tightly sealed and stored in a cool place.
7、 Testing unit
Jilin Geological Science Research Institute, Liaoning Geological and Mineral Resources Research Institute, Hubei Geological Experimental Research Institute, Geological Experimental Testing Center, Fujian Geological Testing Research Center, Anhui Geological Experimental Research Institute, Chengdu Comprehensive Rock and Mineral Testing Center of Sichuan Geological and Mineral Exploration and Development Bureau, Henan Rock and Mineral Testing Center, Shaanxi Geological and Mineral Experimental Research Institute, Shanxi Rock and Mineral Testing Institute, China Institute of Geology, Geophysics, and Geochemistry, China Atomic Energy, and Shanghai Institute of Ceramics.