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重要文件

398063

Sigma-Aldrich

重铬酸钠 二水合物

ACS reagent, ≥99.5%

同義詞:

红矾钠

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About This Item

線性公式:
Na2Cr2O7 · 2H2O
CAS號碼:
分子量::
298.00
EC號碼:
MDL號碼:
分類程式碼代碼:
12352302
PubChem物質ID:
NACRES:
NA.21
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等級

ACS reagent

品質等級

化驗

≥99.5%

形狀

crystals

反應適用性

reagent type: oxidant

雜質

≤0.005% NH4OH ppt.
≤0.005% insolubles

pH值

3.5 (20 °C, 100 g/L)

mp

91 °C (lit.)

負離子痕跡

chloride (Cl-): ≤0.005%
sulfate (SO42-): ≤0.01%

正離子痕跡

Al: ≤0.002%
Ca: ≤0.003%

SMILES 字串

O.O.[Na+].[Na+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O

InChI

1S/2Cr.2Na.2H2O.7O/h;;;;2*1H2;;;;;;;/q;;2*+1;;;;;;;;2*-1

InChI 密鑰

JYDRNIYTFCBIFC-UHFFFAOYSA-N

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一般說明

Sodium dichromate dehydrate (SDD), a hexavalent chromium compound[1] is commonly used as an oxidizing agent.[2] Chromium (VI) compounds are genotoxic and group 1 IARC (International Agency for Research on Cancer) carcinogen.[3] SDD is one of the common contaminants found in drinking water. Its toxic effects and carcinogenicity has been studied.[1][3][4][5]

應用

Sodium dichromate dehydrate may be used in preparing Jones reagent which is employed for oxidation reactions.[6] It may be used in the oxidation of arylalkanes.[7]

訊號詞

Danger

危險分類

Acute Tox. 2 Inhalation - Acute Tox. 3 Oral - Acute Tox. 4 Dermal - Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 1B - Eye Dam. 1 - Muta. 1B - Ox. Sol. 2 - Repr. 1B - Resp. Sens. 1 - Skin Corr. 1B - Skin Sens. 1 - STOT RE 1 Inhalation

儲存類別代碼

5.1B - Oxidizing hazardous materials

水污染物質分類(WGK)

WGK 3

閃點(°F)

Not applicable

閃點(°C)

Not applicable


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Questions

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  1. How is shipping temperature determined? And how is it related to the product storage temperature?

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    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer
    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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