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Sequential injection system with in-line solid phase extraction

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Nguồn:
Người gửi: Nguyễn Hòa
Ngày gửi: 12h:16' 11-07-2018
Dung lượng: 3.5 MB
Số lượt tải: 1
Số lượt thích: 0 người
Presented by Thuan Hoa Nguyen

Department of Chemistry, Faculty of Science and Technology, Thammasat University
Sequential injection system with in-line solid phase extraction and soil minicolumn for determination of zinc and copper
in soil leachates
Justyna Paluch, Raquel B.R. Mesquita, Víctor Cerdà, Joanna Kozaka, Marcin Wieczorek, Antóni O.S.S. Rangel

I ntroduction
Source of Morin
One-Pot Hydrothermal
Up & Down converted photoluminescence (dual readout)
Carbon quantum dots (properties and applications)
Method for determination of Morin
Introduction
CD solution
Healthy body
The liver
The kidneys
The nervous system
The immune system
toxic to the cytologic and physiologic
industrial, urban, agricultural,
gardening, forestry
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zinc
copper

The effective monitoring of waters affected by soil leachates
Identification of the potential sources of pollution
Introduction
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Determination of copper and zinc
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Introduction
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objective
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To develop sequential injection system with in-line solid phase extraction and soil minicolumn for determination of zinc and copper in soil leachates
Introduction
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Reaction
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Form complex with di valence metals
1-(2-Pyridylazo)-2-naphthol (PAN)
The metal ions (Cu2+, Zn2+) form complex PAN reagent due to the similar binding ability towards these metal ions.
Absorbance maximum
at 560nm
Absorbance maximum
at 482 nm
Experiment
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Experiment
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SIA - SPE method for copper and zinc determination
Off-line laboratory scale soil core (LSSC)
In-line soil mini-column (ILSM)
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7
8
6
4
5
3
2
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Experiment
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50 mL
The LSSC columns
consisting in acrylic cylinders (h = 20 cm, d = 8 cm)
Two types of soil were used:
Forest soil in Northwest Portugal
Agricultural soil in Northwest Portugal
acidified to pH ≈ 2 before determination
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laboratory scale soil core
Experiment
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The In-Line Soil Mini-columns (ILSM)
Two types of soil were used:
Forest soil in Northwest Portugal
Agricultural soil in Northwest Portugal
(h = 3 cm, d = 2 cm)
with surface soil with about 3 g
acidified to pH ≈ 2 before determination
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Experiment
CD solution
SIA - SPE method for copper and zinc determination
Off-line laboratory scale soil core (LSSC)
In-line soil mini-column (ILSM)
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7
8
6
4
5
3
2
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Experiment
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SIA - SPE method for copper and zinc determination
Detector
Waste
PAN Reagent
Standard
Buffer
mRC
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Off-line laboratory scale soil core (LSSC)
( Zn2+)
( Zn2+ & Cu2+)
Experiment
CD solution
SIA - SPE method for copper and zinc determination
Detector
Waste
PAN Reagent
Standard
Buffer
mRC
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Off-line laboratory scale soil core (LSSC)
The Chelex 100 chelating resin
( Zn2+)
Experiment
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SIA - SPE method for copper and zinc determination
Detector
Waste
PAN Reagent
Standard
Buffer
mRC
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Off-line laboratory scale soil core (LSSC)
( Zn2+ & Cu2+)
RESULTS and
DISCUSSION
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RESULTS AND DISCUSSION
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Bi parametric determination of zinc and copper
Calibration curves
for Zn2+
for the sum of Zn2+ + Cu2+
Calibration curves
for Cu2+
Concentration values
for Zn2+
for Cu2+
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RESULTS AND DISCUSSION
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Sample volume
Colorimetric reaction
Reagent solution
Optical path length
354 µL - 530 µL  413 µL
118, 177, 236 and 295 µL  236 µL
5 cm
○ Influence of the sample
◊ reagent
236 µL
413 µL
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RESULTS AND DISCUSSION
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Analytical parameters of the SI-SPE method for Zn2+ + Cu2+ determination.
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RESULTS AND DISCUSSION
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Interference assessment
% interference =
absorbance for analyte (interfering ion) – absorbance for analyte
absorbance for analyte
x 100
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The developed SI-SPE method can be used for determination
of zinc and copper in rain water and soil leachate samples with
No significant interferences.
RESULTS AND DISCUSSION
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Accuracy assessment
 Both analytes can be determined with satisfactory accuracy.
& comparing results attained with the SI-SPE method and ICP-OES determination and certified reference samples.
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RESULTS AND DISCUSSION
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Determination of Zn2+ and Cu2+ in rain water and leachate samples collected from LSSC Determination of Cu2+ in CRM samples of waste and ground water.
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EUH-3 (EnviroMAT Waste Water)
ES-H-2 (EnviroMAT Ground Water)
Copper determination accuracy assessment
RESULTS AND DISCUSSION
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Application
The determination of zinc and copper leachate samples collected
from ILSM-column
 The use of fertilizer resulted in increase of the concentrations of both zinc and copper in leachate from forest soil.

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RESULTS AND DISCUSSION
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Analytical Application of the As-Obtained CDs
Conclusions
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CONCLUSIONS
Small amount of sample and reagent
Low detection limits
Sensitive
Time saving
V
Portable
Cost-effective
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Determination
of zinc and copper
in water
SI-SPE
method

PAN reaction
Automated and versatile systems
RESULTS AND DISCUSSION
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Analytical Application of the As-Obtained CDs
Thanks You

for Your Attention
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