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> Figure 11. RP-HPLC values vs. all within-range Ohmicron values
Ohmicron RaPID assay
SUMMARY AND CONCLUSIONS - SR97_320019
SR97_32
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5
y =
0.00501
+
1.4757x
R
2
=
0.867
4
3
2
1
0
Figure
11.
RP-HPLC
values
vs.
all
0
1
3
2
within-range
Ohmicron
values.
TNT
Equivalents,
RP-HPLC
(
g/L)
0.9
STD
Set
A
0.8
STD
Set
B
STD
Set
C
Well
622
0.7
Well
743
Well
745
0.6
0.5
0.4
0.3
0.2
Figure
12.
Serial
dilutions
of
well
1
0.1
10
water
compared
with
standard
curve.
TNT
(
g/L)
dard
curve.
Each
test
runs
with
its
own reference
dilutions
are
compared
with
the
slope
of
the
cali-
standard
to
mark
the
end-point
of
the
color
devel-
bration
curve
(Fig.
12),
little
or no
matrix
effect
opment.
Duplicate
analyses
require
another
was
apparent.
The
wells
from
Umatilla
and
Bang-
matching
reference
standard.
They
also
produce
or
did
appear
to
have
a
positive
matrix
interfer-
the
quickest
analyses: 10
minutes
vs.
45 to 90
min-
ence.
The
most
accurate
determinations
were
utes
for
the
other
kits.
The
use
of
concentration
achieved
when
samples
required
substantial
ranges
for
quantitation
emphasizes
the
qualitative
dilution
with
deionized
water
to
fall
within
the
nature
of
the
analyses.
Although
not
required,
a
range
of
the
kit.
The
largest
deviations
from
RP-
TNT
standard
curve
was
produced
using
the
HPLC
values
occurred
when
samples
were
anal-
numerical
values
from
the
reflectometer
(Fig.
13).
yzed
without
dilution.
The cost of
this
kit
is
inter-
The
standard
curve
published
with
the
kit
is
quite
mediate
and
could
be
lowered
approximately
different.
The
accuracy
and
precision
of
the
analy-
50%
by
buying
the
assay
tubes
in
bulk
and
run-
ses
are
plotted
with
references
to
the
ranges
speci-
ning
only
one
standard
and
one
negative
control
fied
on
the
color
card
and
reflectometer
conver-
each
assay.
sion
chart.
In
all
cases,
the
reflectometer
and
color
card
agreed.
The
ranges
are
filled
in with
fre-
DTECH
quency
of
occurrence
values
(Fig.
14).
Except
for
The
DTECH
kits
are
small
and
completely
self-
one
value
in
the
2545-g/L range,
the
kit
overes-
contained
field
kits.
The
materials
for
four
sam-
timated
the
RP-HPLC
values.
Multiplying
the
ples
could
be
carried
in a
large
coat-pocket.
They
range
as
detected
by
the
dilution
factor
produced
do
not
include
provisions
for
producing
a
stan-
12
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