Hach DR/700 Procedures Manual page 684

PHOSPHONATES,
16.
Multiply the
result by the
appropriate value in
Table 2 to obtain the
actual concentration
of the sample.
Note: Results may be
expressed in terms of
active phosphonic acid
by picking the
appropriate conversion
factor and using the
equation in Table 3.
Table 2. Concentration Conversions
Sample volume (mL)
50
25
10
5
1
mg/L Phosphonate = Instrument Reading x Multiplier
Table 3. Phosphonate Activity
Conversion Factors
Type of Phosphonic
Acid
Bayhibit AM, PBTC
Dequest 2000, Wayplex NTP, ATMP
Dequest 2010, Wayplex HEDPA-60, HEDP
Dequest 2041, EDTMPA
Dequest 2051, HMDTMPA
Dequest 2060, DETPMPA
Active Phosphonic
=
Acid, mg/L
continued
Multiplier
Phosphonic Acid Value
from Step 15
0.1
0.2
0.5
1.0
5.0
Conversion
Factor
2.84
1.050
1.085
1.148
1.295
1.207
Conversion
x
Factor
81-10