天堂网亚洲,天天操天天搞,91视频高清,菠萝蜜视频在线观看入口,美女视频性感美女视频,95丝袜美女视频国产,超高清美女视频图片

PRECIOUS METALS

PRECIOUS METALS ??? ???
?? ??:
???:
PRECIOUS METALS
???(??):
PRECIOUS METALS;PRECIOUS METALS, PLASMA STANDARD SOLUTION;Precious Metals, plasma standard solution, Au, Ir, Os, Pd, Pt, Re, Rh, Ru @ 100μg/mL;Precious Metals, plasma standard solution, Specpure, Au, Ir, Os, Pd, Pt, Re, Rh, Ru @ 100g/ml;Precious Metals, plasma standard solution, Specpure(R), Au, Ir, Os, Pd, Pt, Re, Rh, Ru @ 100μg/ml
CBNumber:
CB4479907
???:
AuIrPdPtReRhRu
??? ??:
1080.86
MOL ??:
Mol file

PRECIOUS METALS ??

??? ??
??
???
?? ?? ? ????.
?? ??
ACGIH: Ceiling 2 ppm
OSHA: Ceiling 5 ppm(7 mg/m3)
NIOSH: IDLH 50 ppm; Ceiling 5 ppm(7 mg/m3)
??
  • ?? ? ?? ??
????(UN No.) UN1789
?? ?? 8
???? II
????(GHS):
?? ?:
??·?? ??:
?? ??·?? ?? ?? ?? ?? ?? ? ?? ?? P- ??
??????:
NFPA 704
0
3 0

PRECIOUS METALS C??? ??, ??, ??

??

Precious Metals, plasma standard solution is useful as a standard for the determination of metals by inductively coupled plasma-mass spectrometry.

?? ??

These are the metals gold, silver, and platinum,which are used for coinage, jewelry, and ornaments,and also for industrial applications.Expense or rarity alone is not the determiningfactor; rather, a value is set by law, with thecoinage having an intrinsic metal value as distinctfrom a copper coin, which is merely atoken with little metal value. The term noblemetal is not synonymous, although a metal maybe both precious and noble, as platinum.Although platinum was once used in Russia forcoinage, only gold and silver fulfill the threerequisites for coinage metals. Platinum does nothave the necessary wide distribution of source.The noble metals are gold, platinum, iridium,rhodium, osmium, and ruthenium. Unalloyed,they are highly resistant to acids and corrosion.Radium and certain other metals are moreexpensive than platinum but are not classed asprecious metals. Because of the expense of theplatinum noble metals, they may be alloyedwith gold for use in chemical crucibles.

PRECIOUS METALS ?? ?? ? ???

???

?? ??


PRECIOUS METALS ?? ??

???( 2)?? ??
??? ?? ??? ?? ?? ? ??
Alfa Aesar --
tech@alfa.com United States 6814 81
VWR International --
solutions@vwr.com United Kingdom 6548 82

Copyright 2019 ? ChemicalBook. All rights reserved