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Species 
Toxicant
Test concs
(m g L^{1}) 
Test Duration & End point 
NOECd
m g L^{1} 
LOECd
m g L^{1} 
Toxicity Value
(LC_{50} or EC_{50}) f 
Total Hardness
mg L^{1 }CaCO_{3}

Cladocera
C. dubia 
Cu(II)
{18, 32, 56, 100, 180}^{a} 
48h survival 
<18.0 
18.0 
24.0(28.021.0) 
59.4 
Cu(II)
{5.6, 10, 18, 32, 56}^{a} 
7d (minimum) survival 
10.0 
18 
20.0(24.017.0 
59.4 
7d (minimum) reproduction 
<5.6 
5.6 
22.2(24.118.5) 
59.4 
Amphipod
P. fluviatilis 
Cu(II)
{10, 18, 32, 56, 100}^{a} 
48h survival 
18.0 
32.0 
61.0(72.062.0) 
39.2 
Cu(II)
{18, 32, 56, 100}^{a} 
32d survival 
<5.6 
5.6 
4.0(2.06.0) 
39.2 
32d reproduction 
<5.6 
5.6 
9.0** 
39.2 
^{
a Nominal concentrations.
d NOEC and LOEC were calculated
using oneway analysis of variance (ANOVA), and appropriate USEPA
approved hypothesis testing at a significance level of p < 0.05.
f LC50 and EC50
values were derived from either Probit analysis, trimmed SpearmanKarber
or Linear Interpolation. 95% confidence intervals are given in
parentheses.
** EC50 toxicity curve was incomplete, no confidence
intervals were able to be calculated.
Chromium VI
Species
Toxicant
Test concs
(m g L1)
Test Duration & End point
NOEC d
m g L1
LOEC d
m g L1
Toxicity Valuef
(LC50 or EC50)
Cladocera
C. dubia
Cr(VI)
{10, 18, 32, 56, 100}a
48h survival
32
56
41.0(47.036.0)
Cr(VI)
{1.8, 3.2, 5.6, 10, 18}a
7d min survival
18.0
>18.0
>18.0
7d min reproduction
5.6
10.0
9.3**
Amphipod
P. fluviatilis
Cr(VI)
{10, 18, 32, 56, 18}a
48h
survival
56.0
100.0
>100
Cr(VI)
{18, 32, 56, 18}a
32d
survival
<18.0
18.0
9.0**
32
reproduction
<18.0
18.0
9.0**
a Nominal concentrations.
d NOEC and LOEC were calculated
using oneway analysis of variance (ANOVA), and appropriate USEPA
approved hypothesis testing at a significance level of p < 0.05.
f LC50 and EC50
values were derived from either Probit analysis, trimmed SpearmanKarber
or Linear Interpolation. 95% confidence intervals are given in
parentheses.
** EC50 toxicity curve was incomplete, no confidence
intervals were able to be calculated.
Arsenic V
Species
Toxicant
Test concs
(m g L1)
Test Duration & End point
NOEC d
m g L1
LOEC d
m g L1
Toxicity Valuef
(LC50 or EC50)
Cladocera
C. dubia
As(V)
{180, 320, 560, 1800, 3200}a
48h survival
560
1800
1930(26101420)
As(V)
{56, 100, 180, 320, 560}a
7d (minimum) survival
560
>560
>560
7d min reproduction
320
560
491**
Amphipod
P. fluviatilis
As(V)
{1800 – 18000}a
48h survival
1800
3200
8900(107007600)
As(V)
{560 – 5600}a
32d survival
<560
560
481(582293)
32d reproduction
560
1000
232(7240)
a Nominal concentrations.
d NOEC and LOEC were calculated
using oneway analysis of variance (ANOVA), and appropriate USEPA
approved hypothesis testing at a significance level of p < 0.05.
f LC50 and EC50
values were derived from either Probit analysis, trimmed SpearmanKarber
or Linear Interpolation. 95% confidence intervals are given in
parentheses.
** EC50 toxicity curve was incomplete, no confidence
intervals were able to be calculated.Copyright
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