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Merck
CN

69749

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
UNSPSC Code:
12164500
NACRES:
NA.21
PubChem Substance ID:
329761925
EC Number:
200-237-1
Beilstein/REAXYS Number:
3919382
MDL number:
MFCD00013140

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Product Name

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

InChI key

ZVNPWFOVUDMGRP-UHFFFAOYSA-N

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)

SMILES string

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

grade

ACS reagent

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

Quality Level

100

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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

Storage Class

13 - Non Combustible Solids

wgk

WGK 3

flash_point_f

494.6 °F - closed cup

flash_point_c

257 °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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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)
Improved method for the automatic determination of serum inorganic phosphate.
D S Young
Journal of clinical pathology, 19(4), 397-399 (1966-07-01)
Ayman A Gouda et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 130, 480-487 (2014-05-13)
Simple, rapid and accurate high performance liquid chromatographic (HPLC) and spectrophotometric methods are described for determination of antihistaminic acrivastine in capsules. The first method (method A) is based on accurate, sensitive and stability indicating chromatographic separation method. Chromolith® Performance RP-18e

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