Phosphonates
Phosphonates
Phosphonates_PP_Other_PUV_Eng_Ody.fm Page 3 of 6
To express results in terms of active phosphonate, multiply the final value in
step 15 by the appropriate conversion factor in Table 2 .
13. Touch Zero.
The display will show:
0.00 mg/L PO
4
3–
14. Wipe the prepared
sample and place it into
the cell holder.
Touch
Read.
Results will appear in
mg/L PO
4
3–
.
15. Multiply the value in
step 14 by the appropriate
multiplier in Tab le 1 to
obtain the actual
phosphonate
concentration.
Complete steps 13–15
within three minutes after
the timer beeps.
Table 1 Expected Ranges with Multipliers
Expected Range
(mg/L phosphonate)
Sample Volume (mL) Multiplier
0–2.5 50 0.1
0–5 25 0.2
0–12.5 10 0.5
0–25 5 1.0
0–125 1 5.0
Zero
10 mL
See
Table 1
Table 2 Conversion Factors by Phosphonate Type
Phosphonate Type Conversion Factor
PBTC 2.84
NTP 1.050
HEDPA 1.085
EDTMPA 1.148
HMDTMPA 1.295
DETPMPA 1.207
HPA 1.49
active phosphonate (mg/L) = phosphonate concentration from step 15 × conversion factor
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