Re: bernd 15-01-02

• To: "David L Parkhurst" <dlpark@xxxxxxxx>
• Subject: Re: bernd 15-01-02
• From: "Fam Ehret" <famehr@xxxxxx>
• Date: Tue, 15 Jan 2002 20:34:54 +0100
• References: <OFA175B81D.30872A99-ON87256AF8.006CE3DB@cr.usgs.gov>

```Still I have to thank you for your last answer last year.
Meanwhile...
I wish you a happy new year and I have some problems
with phreeqc this year, too.

RATES/KINETICS:

- Do I have access on pH in the BASIC? If not -
how can I realize this, I need this examination of pH-value.
I think it would be very important to implement
the access of pH in RATES.

- How often will carry out the loop in RATES?
I build a little inputfile to test this but the
results shown after, don't give any hint.
Is it controled by TIME ?

- If I use the parameter ALK with the command
If ALK < 0.0 Then ....
the value of ALK itself was changed

see input-files above: LoII_MIX129_RATES2 gives pH=5.52
LoII_MIX129_RATES gives pH=6.52
with the same input!?

- Your proposal (email 14/11/01) to rate
with M=-ALK*0.5 doesn't work in Phreeqci 2.5;
in Phreeqci RC1 I'm not sure.

In general:

- In a very great MIX-file I've print out all values of N and see that
the values of N = N(5), what is N in

SOLUTION_MASTER_SPECIES
N NO3- 0.0 N 14.0067
N(+5) NO3- 0.0 N
N(+3) NO2- 0.0 N
N(0) N2 0.0 N
N(-3) NH4+ 0.0 N

- If one set the Redox-condition:
redox Fe(2)/Fe(3)
in the solutions and then call up many MIX commands in the kind:

MIX 121
1 0.00208268
2 0.00000000
3 0.01971970
1120 0.97819763
USE equilibrium_phases 2
SAVE solution 1121
END

will then the Redox-condition be current/valid for all the
following MIXings?

- If I use the same MIX - number several times, does it have any
consequences ?

Bernd

Bernd Ehret (bernd.ehret@xxxxxxxxxxxxx)
Brandenburg University of Technology Cottbus
Postfach 101344
D-03013 Cottbus

```

Attachment: LoII_MIX129_RATES2.pqi
Description: Binary data

Attachment: LoII_MIX129_RATES.pqi
Description: Binary data

Complete Water Resources Division Software