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  • uorescence quenching of (11) Kjafia/english/jfia/contents/21_2/JFIA2004V0021… · mg/ml) being st ardized by chelatometric titration with ED The stock solutions (10.0 mg/ml) of aluminum
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J. Flow Injection Anal., Vol. uorescence quenching of ow injection analysis. Copper (11) uenches Anisidine lue's fluorescence and can then be uorescence of Anisidine lue. The present method etermination of co r alloy removing interferin cation exchange in tartrate . The detection limit 27yglml and the sa K ow injection analysis, co er is one of very opular elements in environments st of recent sensitive determination in water an les using s detection has hardly been applied to the * Corresponding author. E-mail: [email protected] - - tes of resorcinol y certain metal ions. The er in brass couple with on-line cation exc ange separation of All the reagents used were of analytical

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Page 1: uorescence quenching of (11) Kjafia/english/jfia/contents/21_2/JFIA2004V0021… · mg/ml) being st ardized by chelatometric titration with ED The stock solutions (10.0 mg/ml) of aluminum

J. Flow Injection Anal., Vol.

uorescence quenching of

ow injection analysis. Copper (11) uenches Anisidine lue's fluorescence and can then be

uorescence of Anisidine lue. The present method

etermination of co r alloy removing interferin

cation exchange in tartrate . The detection limit 27yglml and the sa

K ow injection analysis, co

er is one of very opular elements in environments

st of recent

sensitive determination in water an les using s

detection has hardly been applied to the

* Corresponding author. E-mail: [email protected]

- -

tes of resorcinol

y certain metal ions. The

er in brass couple with on-line cation exc ange separation of

All the reagents used were of analytical

Page 2: uorescence quenching of (11) Kjafia/english/jfia/contents/21_2/JFIA2004V0021… · mg/ml) being st ardized by chelatometric titration with ED The stock solutions (10.0 mg/ml) of aluminum

reagent grade, and distilled and deionized water was further puri (Japan Millipore, Tokyo) the work.

was buffered a t pH 6.3 with acetate. Copper (ID stock solution was prepared

by dissolving 1.1005 g copper plate in 20 ml of 7 M nitric acid and diluting to 1000 ml with water, the accurate copper concentration (1.10 mg/ml) being s t ardized by chelatometric titration with ED

The stock solutions (10.0 mg/ml) of aluminum (III), calcium (II), cobalt (II), iron (III), lead (II), magnesium (II), nickel (II), and zinc (II) were prepared a s 0.1 M hydrochloric acid solutions from chloride of each metal.

Sodium nitrate, sodium sulfate, sodium chloride, disodium hydrogenphosphate, and sodium bromide were prepared a s 0.1 M hydrochloric acid solutions and used for study on the effect of anions.

Tartaric acid solution was prepared by dissolving its L-form in water and its pH was adjusted with sodium hydroxide solution.

A strongly acid ion exchange r Bio-Rad AG 50W-X8, -400 mesh (Bio- Laboratories, U.S.A.) was used for on-line separation of copper. A mini column was

acking the ion exchange resin in a polytetrafluoroethylene

ged a t the ends with cotton.

aratus block diagram of the flow-injection

analysis system used in this work is illustrated w system was assembled from tubing and connectors. ogaku spectrofluorometric

ector S-3350 was used to monitor the nisidine Blue (excitation m; fluorescence wavelength, rier and reagent solutions

were delivered by a GL Scie

measured by a To meter.

injected into the carrier solution (0.1 pH 4.0, 1.75 ml/min), pa

ange resin column then mixed with

Blue solution (pH 6.3, 1.75 ml/min), followed by monitoring the fluorescence of Anisidine Blue.

for

C, carrier (0.1 M t Anisidine Blue solution (pH 6.3); P, pump; S, sample (100 l) ; IC, ion exchange column; RC, reaction coil; D,

rass was taken in a

loric acid by gentle was evaporated

ed to it and This treatment

one milliliter

50-ml volumetric flask and diluted to the mark with 0.1 M tartaric acid of which pH value had been adjusted to solution. About 1 prepared a s above was injected into the FIA system.

Basic flow injection anal were first studied using a flow injection system without a cation exchange column a s follows.

ffect of concentration of Anisid The effect of the concentration of

Page 3: uorescence quenching of (11) Kjafia/english/jfia/contents/21_2/JFIA2004V0021… · mg/ml) being st ardized by chelatometric titration with ED The stock solutions (10.0 mg/ml) of aluminum

was examined over the range of . The Anisidine

e solution was use hereinafter.

Metal ions Added1 pg/ml Cu recovery,%

solutions The effect of the total flow rate on the

fluorescence intensity and the stability of the base line was examined over the range of 1.6 to

the flow rates of the carrier

increase in the stabil However, the pressur became so high a t the that the solutions leaked a t the connectors. Accordingly, subsequent experiments were

ow rate of 3.5 mllmin.

The effect of eight metal ions was studied keeping the concentration of copper (11) at 2.0

2 pg Cu(II)/ml added.

pg/ml. The results obtained are summarized in Table 1. Magnesium (II), calcium (II), and aluminum (111) did not interfere even a t 200 Anions Added /M Cu recovery,%

pg/ml, while the other (heavy) metals tested gave serious interferences a t this concentration Nos- 0.10 143.7

0.01 108.5 pglml gave the positive error of 0.10 99.9

more than 5 % in the measurement of copper 0.05 101.9 (11). These errors might be attributable to 0.01 104.6

heavy Cl- 0.10 101.9 refore,

ange separation in tartrate 0.05 103.9

medium was employed in the flow injection 0 1 103.0 system to avoid the interference from other Po43- 0.10 68.5 heavy metals described below. 0.05 88.1

The effect of common anions was examined over the concentration range of 0.01 to 0.1 and the results obtained were listed in Tab Sulfate and bromide did not interfere, b nitrate gave positi

ng in the positive errors. On the other hand, phosphate might react with copper (11) to form stable complexes, leading to the negative errors.

Page 4: uorescence quenching of (11) Kjafia/english/jfia/contents/21_2/JFIA2004V0021… · mg/ml) being st ardized by chelatometric titration with ED The stock solutions (10.0 mg/ml) of aluminum

1 Cu(II) recovery, %

by Japan Copper and Brass Association.

(Accepted November


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