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Metol

ACS reagent, for spectrophotometric det. of inorganic phosphate, ≥99.0%

Synonym(s):

4-(Methylamino)phenol hemisulfate salt, Metol

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About This Item

Linear Formula:
C7H9NO · 1/2H2SO4
CAS Number:
55-55-0
Molecular Weight:
172.19
Beilstein/REAXYS Number:
3919382
EC Number:
200-237-1
MDL number:
MFCD00013140
UNSPSC Code:
12164500
PubChem Substance ID:
329761925
NACRES:
NA.21

grade

ACS reagent

Quality Level

100

assay

≥99.0% (NT)
≥99.0%

form

crystals

autoignition temp.

989 °F

quality

for spectrophotometric det. of inorganic phosphate

technique(s)

UV/Vis spectroscopy: suitable

ign. residue

≤0.1%

mp

260 °C (dec.) (lit.)

solubility

H2O: 50 mg/mL, clear

application(s)

general analytical

SMILES string

OS(O)(=O)=O.CNc1ccc(O)cc1.CNc2ccc(O)cc2

InChI

1S/2C7H9NO.H2O4S/c2*1-8-6-2-4-7(9)5-3-6;1-5(2,3)4/h2*2-5,8-9H,1H3;(H2,1,2,3,4)

InChI key

ZVNPWFOVUDMGRP-UHFFFAOYSA-N

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General description

Metol (4-methylaminophenol sulphate) is white crystalline which helps in determination of phosphate by reduction reaction of phosphomolybdic acid to molybdenum blue with intense colour. It is used as reducing agent. A solution of Metol could be prepared by dissolving a known amount in water with hydrated sodium sulphite along with which few drops of Brij needs to be added.

Legal Information

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Warning

Hazard Classifications

Acute Tox. 4 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - Skin Sens. 1 - STOT RE 2

wgk_germany

WGK 3

flash_point_f

closed cup

flash_point_c

closed cup

ppe

dust mask type N95 (US), Eyeshields, Faceshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
BCBZ5839
BCBZ6431
BCBX3596
BCBV5510
BCBS9621V

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D S Young
Journal of clinical pathology, 19(4), 397-399 (1966-07-01)
A single-solution method for the determination of soluble phosphate in sea water.
Murphy, James, and J. P. Riley.
J. Mar. Biol. Ass. U.K., 37, 9-14 (1958)
Ayman A Gouda et al.
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