247626
二氧化硫 溶液
ACS reagent, ≥6%
别名:
亚硫酐, 亚硫酸
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关于此项目
线性分子式:
H2SO3
化学文摘社编号:
分子量:
82.08
NACRES:
NB.24
PubChem Substance ID:
UNSPSC Code:
12352300
EC Number:
231-973-1
MDL number:
Assay:
≥6% SO2 basis (by Na2S2O3, titration)
Concentration:
≥6%
Form:
liquid
Grade:
ACS reagent
InChI key
LSNNMFCWUKXFEE-UHFFFAOYSA-N
InChI
1S/H2O3S/c1-4(2)3/h(H2,1,2,3)
SMILES string
OS(O)=O
grade
ACS reagent
vapor density
2.3 (vs air)
assay
≥6% SO2 basis (by Na2S2O3, titration)
form
liquid
concentration
≥6%
ign. residue
≤0.005%
density
1.03 g/mL at 25 °C (lit.)
anion traces
chloride (Cl-): ≤5 ppm
cation traces
Fe: ≤5 ppm, heavy metals (as Pb): ≤2 ppm
Quality Level
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Application
Sulfurous acid can be used as a reducing agent in chemical synthesis.
General description
Sulfurous acid (H2SO3), a weak diprotic acid, is formed when sulfur dioxide (SO2) dissolves in water. Sulfurous acid is a complex mixture of various hydrates of SO2 and the ions H3O+, S2O52- and HSO3-. The predominant species present in the solution are pH dependent.
signalword
Danger
hcodes
Hazard Classifications
Acute Tox. 4 Inhalation - Eye Dam. 1 - Skin Corr. 1B
存储类别
8B - Non-combustible corrosive hazardous materials
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
The thermodynamic ionization constants of sulfurous acid at 25?1.
Tartar HV and Garretson HH.
Journal of the American Chemical Society, 63(3), 808-816 (1941)
M Kharina et al.
Applied biochemistry and biotechnology, 179(2), 307-320 (2016-01-29)
Sulfurous acid was used for pretreatment of sugar beet pulp (SBP) in order to achieve high efficiency of both extraction of carbohydrates and subsequent enzymatic hydrolysis of the remaining solids. The main advantage of sulfurous acid usage as pretreatment agent
Miquel Pascual et al.
Journal of the science of food and agriculture, 95(15), 3067-3076 (2015-07-16)
Rainfed viticulture, mainly in semi-arid environments, is limited by environmental variability, particularly precipitation and its seasonal distribution, and soil water availability, thus ultimately determining the final quality of grape and wine. Studies on the feasibility of practices such as canopy
Daniela Vullo et al.
Bioorganic & medicinal chemistry letters, 16(12), 3139-3143 (2006-04-20)
An inhibition study of the cytosolic carbonic anhydrase (CA, EC 4.2.1.1) isozyme VII (hCA VII) with anions has been conducted. Cyanate, cyanide, and hydrogensulfite were weak hCA VII inhibitors (K(I)s in the range of 7.3-15.2 mM). Cl- and HCO3- showed
Heng Yu et al.
Bioresource technology, 199, 188-193 (2015-09-06)
This study established a new more neutral magnesium bisulfate pretreatment (MBSP) using magnesium bisulfate as sulfonating agent for improving the enzymatic hydrolysis efficiency of corn stover. Using the MBSP with 5.21% magnesium bisulfate, 170°C and pH 5.2 for 60 min
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