start-ver=1.4
cd-journal=joma
no-vol=11
cd-vols=
no-issue=1
article-no=
start-page=155
end-page=160
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1995
dt-pub=19950210
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Ultra-Trace Determination of Phosphate Ion Based on Filtration-Dissolution and Flow-through Spectrophotometric Measurement
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A sensitive spectrophotometric method for the determination of ultra-trace amounts of phosphate ion is proposed. The colored ion associate formed between molybdophosphate and Malachite Green (MG) was filtered through a tiny membrane filter (cellulose nitrate; poresize, 1.0μm; 9mm diameter), dissolved together with the membrane filter in 1cm(3) or less of Methyl Cellosolve; the absorbance of the solution was then measured at 627nm with a flow-through system equipped with an autosampler. The absorbance, the standard deviation and the relative standard deviation of the reagent blank were 0.0270, 0.0005 and 1.8%, respectively. A calibration graph was linear over the range from 0.018 to 1.0ng cm(-3) (1ppb) of phosphorus using 40cm(3) of sample solutions; the detection limit corresponding to two-times the standard deviation of the reagent blank was 3ppt of phosphorus. By using the proposed method, phosphate ion in pure water samples were determined.
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=SusantoJoko P.
en-aut-sei=Susanto
en-aut-mei=Joko P.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
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=3
ORCID=

en-aut-name=MikasaHiroshi
en-aut-sei=Mikasa
en-aut-mei=Hiroshi
kn-aut-name=三笠博司
kn-aut-sei=三笠
kn-aut-mei=博司
aut-affil-num=4
ORCID=

en-aut-name=HoriYoshikazu
en-aut-sei=Hori
en-aut-mei=Yoshikazu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
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=RC Research Laboratory, Tokuyama Co., Ltd

affil-num=5
en-affil=
kn-affil=RC Research Laboratory, Tokuyama Co., Ltd
en-keyword=Phosphate determination
kn-keyword=Phosphate determination
en-keyword=filtration-dissolution
kn-keyword=filtration-dissolution
en-keyword=molybdophosphate-Malachite Green ion associate
kn-keyword=molybdophosphate-Malachite Green ion associate
END