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中文名稱：人發(fā)成分分析標(biāo)準(zhǔn)物質(zhì)(頭發(fā))
英文名稱：Human Hair訂貨以英文名稱為準(zhǔn)。
產(chǎn)品編號(hào)：NIES-CRM-13CAS：/
品牌：標(biāo)準(zhǔn)物質(zhì)產(chǎn)地：進(jìn)口
標(biāo)準(zhǔn)值：見(jiàn)證書分子式：/
規(guī)格 市場(chǎng)價(jià)(元) 折后價(jià)(元) 供貨周期 數(shù)量 加入購(gòu)物車 3g 0.00 0.00 3-4周 加入購(gòu)物車
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產(chǎn)品詳細(xì)介紹
This certified reference material (CRM) is prepared for use in evaluation of accuracy of methylmercury and selected heavy metals analysis of human hair and other samples with similar matrices. Each bottle contains approximately 3 g of homogeneous human hair powder.
Preparation of Material
The male scalp hair of Japanese was collected in 3 barbershops located in Tokyo and Tsukuba in 1980. It was washed with non-ionic detergent, pulverized, sieved and blended. Approximately 3 g of the hair powder (<100 μm) was individually packed in acid-washed borosilicate bottles. The materials have been stored at -20 ℃ in the dark immediately after bottling.
Homogeneity Assessment
The homogeneity of this CRM was evaluated by analyzing 5 subsamples from 5 randomly selected bottles for total Hg and other elements contents. Analysis of variance indicated no variability in Hg content of this CRM at 20-30 mg and in other elements. (e.g., Cu and Zn) at 120 mg aliquot.
Certified Values and Reference Values
Certified values for methylmercury, total Hg, Cd, Cu, Pb, Sb, Se and Zn are shown in Table 1. Certified values were determined by extensive collaboration analyses and were derived from at least 4 independent analytical methods specified in the table.
Reference values shown in Table 2 are given for information only. Note that certified and reference values are expressed on dry weight basis. For drying instruction, see Use below.Table 1, Certified Values
Content*1Constituent Content*1 Method*2 Methyl Hg 3.8±0.4 3,13,14,15 Total Hg 4.42±0.20 2,3,4,5,10 Cd 0.23±0.03 1,8,9,10 Cu 15.3±1.3 1,5,7,8 Pb 4.6±0.4 1,8,10,12 Sb 0.042±0.008 1,5,8,10 Se 1.79±0.17 1,5,6,8,9,10,11 Zn 172±11 1,5,7,8,10
Certified value±uncertainty expressed as μg/g dry weight.Samples should be dried at 85 ℃ for 4 hrs in a conventional electric oven and then cooled in a silicagel dessicator at room temperature before weighting.For detail see text.Method*2
1: Atomic absorption spectrometry (AAS) 2: Cold vapor AAS 3: Pyrolysis-gold amalgamation-AAS 4: Cold vapor atomic fluorescence spectrometry (CVAFS) 5: Instrumental neutron activation analysis 6: Radioactive neutron activation analysis 7: Inductively coupled plasma atomic emission spectrometry 8: Inductively coupled plasme mass spectrometry(ICP-MS) 9: Nitrogen microwave induced plasma mass spectrometry (MIP-MS) 10: Isotope dilution ICP-MS 11: Isotope dilution MIP-MS 12: X-ray fluorescence spectrometry 13: Gas chromatography (GC)-electron capture detection 14: GC-CVAFS 15: Liquid chromatography-ICP-MS Table 2, Reference Values
Constituent Content*1 Constituent Content*1 Al 120 Fe 140 Ag 0.10 Mg 160 As 0.10 Mn 3.9 Ba 2.0 Na 61 Ca 820 S(%) 5.0 Co 0.07 V 0.27 Note: Reference values are not certified and given only for information.
Content*1
μg/g dry weight unless otherwise indicated.Storage
This CRM should be storaged in its original bottle at -20 ℃ immediately after being received. Exposure to sunlight or UV radiation should be avoided because of possible methylmercury decomposition. Storage in a dark-colored polyethylene bag or container is recommended.
