start-ver=1.4
cd-journal=joma
no-vol=6
cd-vols=
no-issue=2
article-no=
start-page=215
end-page=220
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1990
dt-pub=19900410
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Spectrophotometric Determination of Calcium with Dicyclohexano- 24-crown-8 and Propyl Orange by Solvent Extraction/Flow Injection Method
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Calcium in water was determined by a spectrophotometric method involving flow injection coupled with solvent extraction. An ion association complex which formed between a calcium-crown complex ion and a dye anion was extracted into an organic solvent and the absorbance of the organic phase was measured after phase separation. Six derivatives of alkylaminophenylazobenzene sulfonic acid and tetrabromophenolphthalein ethylester were examined as counter anions with dicyclohexano-24-crown-8, and a mixture of benzene and chlorobenzene was examined as an extraction solvent. A suitable method for calcium determination in water was one with Propyl Orange and a (1+1 v/v) mixture of benzene and chlorobenzene. The carrier stream was distilled water, while the reagent stream was comprised of a dye anion and lithium hydroxide. The sampling rate was 20-30 per hour. The calibration graph was linear at concentrations up to 10(-4)M using samples of 100μl. The detection limit corresponding to a signal-to-noise ratio of 3 was 2×10(-7)M; the relative standard deviation was 0.99% for 10 injections of 5×10(-5)M calcium solution. Calcium in river water was determined satisfactorily by the proposed method.
en-copyright=
kn-copyright=

en-aut-name=MotomizuShoji
en-aut-sei=Motomizu
en-aut-mei=Shoji
kn-aut-name=本水昌二
kn-aut-sei=本水
kn-aut-mei=昌二
aut-affil-num=1
ORCID=

en-aut-name=OshimaMitsuko
en-aut-sei=Oshima
en-aut-mei=Mitsuko
kn-aut-name=大島光子
kn-aut-sei=大島
kn-aut-mei=光子
aut-affil-num=2
ORCID=

en-aut-name=YonedaNaomi
en-aut-sei=Yoneda
en-aut-mei=Naomi
kn-aut-name=米田直生
kn-aut-sei=米田
kn-aut-mei=直生
aut-affil-num=3
ORCID=

en-aut-name=IwashidoTadashi
en-aut-sei=Iwashido
en-aut-mei=Tadashi
kn-aut-name=岩知道正
kn-aut-sei=岩知道
kn-aut-mei=正
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=Calcium, Propyl Orange
kn-keyword=Calcium, Propyl Orange
en-keyword=dicyclohexano-24-crown-8
kn-keyword=dicyclohexano-24-crown-8
en-keyword=spectrophotometry
kn-keyword=spectrophotometry
en-keyword=solvent extraction
kn-keyword=solvent extraction
en-keyword=flow-injection method
kn-keyword=flow-injection method
END