start-ver=1.4
cd-journal=joma
no-vol=6
cd-vols=
no-issue=5
article-no=
start-page=737
end-page=745
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1990
dt-pub=19901010
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Liquid-Liquid Extraction Behavior of Inorganic and Organic Anions with Color-Changeable Neutral Extractants
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Color-changeable extractants for acids, acidophores, were synthesized and examined; they were 4-(N, N dimethylaminophenylazo)-pyridines and quinolines. The fundamental physicochemical constants for the acidophores and their ion associates were determined by spectrophotometry. The liquid-liquid distribution was carried out between an aqueous phase and a chloroform phase. A parameter of the extractability of the protonated cations of the acidophores and of several inorganic and organic anions as ion associates was determined on the basis of the assumption that the extraction constant of an ion association complex, log K(ex), is divided into a cationic and an anionic contributions, C and A, respectively. The order of the extractability of the anions was: Br(-)<I(-)<ClO(4)(-)<SCN(-)<Pic(-)<(Ethyl range)(-)<C(12)H(25)-OSO(3)(-). Anionic surfactants could be quantitatively extracted into chloroform with 4-(4-N, N-dimethylaminophenylazo)-2-methylquinoline: the molar absorptivity was 4.5×10(4)l mol(-1) cm(-1) at 560nm. The acidophores once used could be recycled and be used repeatedly.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KubotaHiroki
kn-aut-sei=Kubota
kn-aut-mei=Hiroki
aut-affil-num=1
ORCID=

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=2
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学
en-keyword=N,N-Dimethylaminophenylazoquinoline
kn-keyword=N,N-Dimethylaminophenylazoquinoline
en-keyword=extraction behavior
kn-keyword=extraction behavior
en-keyword=ion associates
kn-keyword=ion associates
en-keyword=parameter of ion extractability
kn-keyword=parameter of ion extractability
en-keyword=spectrophotometry
kn-keyword=spectrophotometry
END

start-ver=1.4
cd-journal=joma
no-vol=6
cd-vols=
no-issue=5
article-no=
start-page=705
end-page=709
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1990
dt-pub=19901010
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Batchwise and Flow-Injection Methods for the Spectrophotometric Determination of Anionic Surfactants with 4-(4-N, N-Dimethyl- aminophenylazo)-2-methylquinoline
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=solvent-extraction Spectrophotometric method for the determination of anionic surfactants in water was developed with -(4-N, N-dimethylaminophenylazo)-2-methylquinoline (MQ) by batchwise and flow-injection techniques. The ion associates of MQ with anionic surfactants extracted into an organic phase showed a blue shift of the maximum absorption wavelength; their molar absorptivities were 4.5×10(4)l mol(-1) cm(-1) at 560nm. In the batchwise method, a 40-fold extraction concentration was possible. In the 20-fold concentration, the calibration graph was linear at concentration ranging from 1×10(-8)M to 7.5×10(-7)M of anionic surfactants, and the mean absorbances of the reagent blank and the 5×10(-7)M anionic surfactant (dodecylsulfate : LS(-)) were 0.024 and 0.518, respectively; the relative standard deviation for 10 measurements of 5×10(-7)M LS(-) was 0.28%. Foreign ions generally existing in river water did not interfere with the determination. This solvent-extraction spectrophotometric method was satisfactorily applied to a flow-injection method. The reagent MQ was recycled and repeatedly used at least for 7 months, and the efficiency of the reagent has not changed during at least this period.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KubotaHiroki
kn-aut-sei=Kubota
kn-aut-mei=Hiroki
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KatsukiMiki
kn-aut-sei=Katsuki
kn-aut-mei=Miki
aut-affil-num=2
ORCID=

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=3
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
en-keyword=Spectrophotometry
kn-keyword=Spectrophotometry
en-keyword=ion association extraction
kn-keyword=ion association extraction
en-keyword=anionic surfactants
kn-keyword=anionic surfactants
en-keyword=4-(4-N,N-dimethylaminophenylazo)-2-methylquinoline
kn-keyword=4-(4-N,N-dimethylaminophenylazo)-2-methylquinoline
en-keyword=batchwise method
kn-keyword=batchwise method
en-keyword=flow-injection method
kn-keyword=flow-injection method
END