1
PHPA Adapter (HPK Test)
Instruction Sheet
WATER BASED FLUID TEST PROCEDURE
1)
Pre-heat HTHP jacket to 285 ºF
2)
Dry HTHP Cell; Insert and tighten stem valve; Invert and place in stand
3)
Add amount of sample (typically 5 mL)
4)
Add DI water (55 mL)
5)
Add 5 mL NaOH (5N); Put lid on and lock in place with set screws
6)
In PA apparatus add 30 mL Boric Acid (3% aq. soln.) and 6 drops bromocresol green- methyl red
indicator (should be a pink color)
7)
Place HTHP cell in heating jacket, keeping the cell inverted
8)
Place PA apparatus on cell, and lock in place with pin
9) Carefully open stem-valve one-quarter turn so that pressure can be released from cell.
10)
After first bubble appears in HPK boric acid solution, start a 30 min. timer.
11)
After 30 min. close stem-valve and lift cell out of the jacket.
12)
Carry out titration in titration bowl using N/50 H
2
SO
4
(solution should turn from dark green to
red/pink color)
13)
Calculate ppb PA from calibration curve.
14) Clean-up is simply done by washing cell and PA apparatus with tap water.
Notes
:
1)
Calibration should be carried out with samples containing the equivalent of 1 ppb, 2 ppb, 4 ppb,
8 ppb PA. Individual calibration curves should be determined for different additives (e.g., PHPA,
CLAY GRABBER, CLAY SYNC etc…)
2)
If more than 30 mL of acid is required, test should be redone with 2.5 mL of sample, and 57.5
mL of DI water.
