Monograph
es .
pubs.acs.org/doi/book/10.1021/acsreagents
ha ng
EXPIRED yo fc
Ammonium Citrate, Dibasic
on an d
nt
ve
rsi
Portions of this monograph have been updated. Please visit http://pubs.acs.org/doi/full/10.1021/acsreagents.4021 for a summary of changes.
ur
re
ABSTRACT
de
rf
or
lin
kt
oc
This monograph for Ammonium Citrate, Dibasic provides, in addition to common physical constants, a general description including typical appearance, applications, and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Insoluble Matter, Residue after Ignition, Chloride, Heavy Metals, Iron, Oxalate, Phosphate, and Sulfur Compounds.
O
eh
ea
O
+H N-O 4
O-NH4+ O OH
d.
Se
OH
Formula Wt 226.19
CAS No.3012-65-5
ve
ch
an
ge
(NH4)2HC6H5O7
og ra
ph
ha
SUPPLEMENTS & UPDATES Authoritative
Expired
Type
Summary
28 Feb 2017
01 Jun 2016
01 Feb 2019
Original
First on-line publication, based on 11th ed.
Other Versions
hi sm
on
Published
ns o
ft
GENERAL DESCRIPTION
tio
Typical appearance . . . . . . . . . . . . . . . . . . . colorless solid Applications . . . . . . . . . . . . . . . . . . . . . . . . determination of phosphates Aqueous solubility . . . . . . . . . . . . . . . . . . . . very soluble
Po r
Downloaded via MOUNT ROYAL UNIV on August 20, 2019 at 17:44:14 (UTC). See https://pubs.acs.org/sharingguidelines for options on how to legitimately share published articles.
Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
su m m ar
(Citric Acid, Diammonium Salt; 2-Hydroxy-1,2,3-propanetricarboxylic Acid, Diammonium Salt)
© 2017 American Chemical Society
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4021.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
es .
pubs.acs.org/doi/book/10.1021/acsreagents
ha ng
SPECIFICATIONS
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . . . . . .
Maximum Allowable 0.005% 0.01% 0.001% 5 ppm 0.001% Passes test 5 ppm 0.005%
su m m ar
. . . . . . . .
on an d
. . . . . . . .
rsi
. . . . . . . .
nt
ve
Insoluble matter . . . . . . . Residue after ignition. . . . Chloride (Cl) . . . . . . . . . Heavy metals (as Pb) . . . . Iron (Fe) . . . . . . . . . . . . Oxalate (C2O4) . . . . . . . . Phosphate (PO4) . . . . . . . Sulfur compounds (as SO4).
yo fc
Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.0–103.0% (NH4)2HC6H5O7
oc
ur
re
TESTS
lin
kt
Assay
[(50.0 × N NaOH) − (mL × N H 2SO4 ) × 7.540 Sample wt (g)
d.
Se
eh
% (NH4)2 HC6H5O7 =
ea
de
rf
or
(By alkalimetry for ammonium). Weigh accurately about 3.0 g of sample and dissolve in 50 mL of water in a 500 mL Erlenmeyer flask. Add exactly 50.0 mL of 1 N sodium hydroxide volumetric solution, place a filter funnel loosely in the neck of the flask, and boil until all the ammonia is expelled (about 10–15 min) as determined with litmus paper. Cool, and add 0.15 mL of thymol blue indicator solution. Titrate the excess sodium hydroxide with 1 N sulfuric acid. One milliliter of 1 N sodium hydroxide corresponds to 0.07540 g of (NH4)2HC6H5O7.
ge
Insoluble Matter
ve
ha
Residue after Ignition
ch
an
[Part 2: Gravimetric Methods; Insoluble Matter]. Use 20 g dissolved in 200 mL of water.
ph
[Part 2: Gravimetric Methods; Residue after Ignition]. Ignite 10 g.
og ra
Chloride
hi sm
on
[Part 2: Colorimetry and Turbidimetry; Chloride]. Use 1.0 g.
ft
Heavy Metals
tio
ns o
[Part 2: Colorimetry and Turbidimetry; Heavy Metals (as Lead); Procedure for Heavy Metals, Method 1]. Dissolve 6.0 g in about 20 mL of water, add 5 mL of dilute hydrochloric acid (1:1), and dilute with water to 30 mL. Use 25 mL to prepare the sample solution, and use the remaining 5.0 mL to prepare the control solution.
Po r
Iron
[Part 2: Colorimetry and Turbidimetry; Iron; Procedure for Iron, Method 1 (Ammonium Thiocyanate)]. Use 1.0 g.
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4021.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
es .
pubs.acs.org/doi/book/10.1021/acsreagents
ha ng
Oxalate
yo fc
Dissolve 5.0 g in 25 mL of water, and add 3 mL of glacial acetic acid and 2 mL of 10% calcium acetate solution. No turbidity or precipitate should appear after standing 4 h. (Limit about 0.05%.)
su m m ar
Phosphate
on an d
[Part 2: Colorimetry and Turbidimetry; Phosphate; Procedure for Phosphate, Method 1 (Direct Molybdenum Blue)]. Mix 4.0 g with 0.5 g of magnesium nitrate hexahydrate in a platinum dish and ignite. Dissolve the residue in 5 mL of water, add 5 mL of nitric acid, and evaporate to dryness. Dissolve the residue in 25 mL of approximately 0.5 N sulfuric acid, and continue as described.
rsi
Sulfur Compounds
Po r
tio
ns o
ft
hi sm
on
og ra
ph
ha
ve
ch
an
ge
d.
Se
eh
ea
de
rf
or
lin
kt
oc
ur
re
nt
ve
To 1.0 g, add 1 mL of hydrochloric acid and 3 mL of nitric acid. Prepare a standard containing 0.05 mg of sulfate ion (SO4), 1 mL of hydrochloric acid, and 3 mL of nitric acid. Digest each in a covered beaker on a hot plate (~100 °C) until the reaction ceases, remove the covers, and evaporate to dryness. Add 0.2–0.5 mg of ammonium vanadate and 10 mL of nitric acid, and digest in covered beakers on the hot plate until reactions cease. Remove the covers, and evaporate to dryness. Add 10 mL more of nitric acid, and repeat the digestions and evaporations. Add 5 mL of dilute hydrochloric acid (1:1), and evaporate to dryness. Dissolve the residues in 4 mL of water plus 1 mL of dilute hydrochloric acid (1:19), and filter through a small filter. Wash with two 2 mL portions of water, dilute with water to 10 mL, and add 1 mL of 12% barium chloride reagent solution to each. Any turbidity in the solution of the sample should not exceed that in the standard. Compare 10 min after adding the barium chloride to the sample and standard solutions.
© 2017 American Chemical Society
C
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4021.20160601 ACS Reagent Chemicals, Part 4
