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1 UQ Water Forum, August 18-19 2015 Sustainable Water Program @ the Global Change Institute Monitoring Bioavailability of Metals and Metalloids in River Water Receiving Mine Water Discharge Dr Trang Huynh, SMI
Transcript of Monitoring Bioavailability of Metals and Metalloids in ... › filething › get › 4808 ›...
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UQ Water Forum, August 18-19 2015
Sustainable Water Program @ the Global Change Institute
Monitoring Bioavailability of Metals and Metalloids in
River Water Receiving Mine Water Discharge
Dr Trang Huynh, SMI
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Research Question
Can the in-situ and time-integrated Diffusive Gradients in Thin Films technique (DGT) replace the series gab samples to determine metal and metalloid concentrations in water receiving mine water discharge?
Dif
fusi
ve
gel
R
e
s
i
n
g
e
l
g
C
waterM2+diffusion
1 2 mm
CSOL
filter Piston holder
ML
LM2+
M2+
M2+
M2+
M2+
M2+
M2+
M2+
M2+
M2+
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What I found…
0
20
40
60
80
100
120
140
160
As
(µg/
L)
Grab samples 0.45um Labile DGT conc.Mean + SD Mean - SDMean of Grab samples
0
40
80
120
160
200
1 2 3 4 5 6 7 8 9 10 11 12
Cd
(u
g/L)
Sampling times (12hrs interval)
0
50
100
150
200
250
300
0
3
6
9
12
15
Al (
µg/
L) f
or
on
ly IR
HB
Al (
µg/
L)
LOR
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Cu
(µ
g/L)
DGT CCB DGT-IRCC DGT-IRDS DGT-IRHB
Grab CCB Grab IRCC Grab IRDS Grab IRHB
Mean Grab CCB Mean Grab IRCC Mean Grab IRDS Mean-IRHB
LOR
ANZECC (TV 95%)
0
20
40
60
80
100
120
140
1 2 3 4 5 6 7 8 9 10 11 12
Cu
(u
g/L
)
Times (12hrs interval)
Grab sample0.45um
Mean grabsamples
Labile DGT conc.
Inorganic Cu
Mean InorganicCu
Cu2+
Mean Cu2+
What Next?
DGT measurement will replace 3 steps for assessing metal/loid toxicant in water in the ANZECC decision tree
Decision tree for metal speciation guideline (ANZECC, 2000)
0.0
1.0
2.0
3.0
4.0
5.0
CCB IRCC IRDS IRHB
Cu
(µ
g/L)
Grab-total Grab dissolved
DGT ANZECC (TV 95%)
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Contact details:
Dr. Trang Huynh
Dr. Sue Vink
References:
Reducing Analytical and Water Quality Monitoring Costs using Diffusive
Gradients in Thin Films (DGT) Technique (ACARP Project C23027)
