Re: [compost_tea] DO meter calibration Question

From: Sonja Peters <peters_sonja_at_hotmail.com>
Date: Wed, 05 May 2004 16:19:39 +0000
Hello.

I been reading the messages on the chat for awhile now.

I work for a company (CropHealth Advising & Research) in Kelowna, BC Canada.
We are doing both foliar and drench trails with AACT on organic fruit trees.

I am having problems calibrating our DO meter.  It is a ICM instrument Model
31520.  I have been in contact with them but they have not been unable to
help me (they are still working on it).  My problem is that the numbers I
need are not on the tables in the manual.

1) Our standard pressure is 756.8mmHg, altitude 6548ft.  Therefore, actual
pressure = 606.2 mmHg and our temp is ~20C.  I have found a chart that lists
solubility of oxygen in water at various temps and pressures that will work
for me (off of SFI website).

2) the salinity of the water is 81 g/l and therefore, chlorinity is 44.8
g/L.  This value is not on the table in the manual (it goes up to a
chlorinity of 20 g/L.

Do you know of any chart that will list oxygen values for chlorinity greater
then 20 g/L?


Thank you
Sonja Peters



>From: "Ted Peterson" <ted.peterson_at_tcsn.net>
>Reply-To: compost_tea_at_yahoogroups.com
>To: <compost_tea_at_yahoogroups.com>
>Subject: Re: [compost_tea] Re: Perceived risk of food-related hazards
>Date: Fri, 30 Apr 2004 12:20:18 -0700
>
>Steve:
>
>Does the compost also need to be tested?  Are there guidelines for compost
>inputs?  It seemed when I read the report that additives to the compost
>were acceptable but not acceptable if added to the tea.  What you indicate
>below is great.  It should be possible to test two independent batches and
>I wouldn't even mind having to test once per year.  However, we are talking
>about certification for organic use aren't we?  Or is this for general
>distribution of ACT?
>
>Ted Peterson
>EW/SOE
>   ----- Original Message -----
>   From: Steve Diver
>   To: compost_tea_at_yahoogroups.com
>   Sent: Friday, April 30, 2004 10:33 AM
>   Subject: [compost_tea] Re: Perceived risk of food-related hazards
>
>
>   Dennis -
>
>   I will try to reply with the limited information
>   available.
>
>   Here is the section from CTTF:
>
>   "Compost tea made with compost tea additives can be applied
>   without restriction if the compost tea production system
>   (same compost batch, additives, and equipment) has been
>   pre-tested to produce compost tea that meets the EPA recommended
>   recreational water quality guidelines for a bacterial indicator of
>   fecal contamination (US EPA, 2000). These indicators and the passing
>   criteria are Escherichia coli (126 CFU/100ml) or enterococci
>   (33 CFU/100ml). At least two compost tea batches must be tested
>   using accepted methodology (APHA-AWWA-WEF, 1999; US EPA, 2000),
>   with the average population of indicator bacteria across compost
>   tea batches used as the measurement of passing."
>
>   I know you said that you can read this yourself.
>
>   All I can add is that the indicators come from EPA
>   standards, as noted above and in the citations.
>
>   Dr. Patricia Millner with USDA-ARS is an expert on
>   these matters and provided the pertinent EPA standards.
>
>   I don't have anything more to add on CTTF, Dennis.
>
>   Feel free to contact me off list if you wish.
>
>   Best wishes,
>   Steve Diver
>
>
>   --- In compost_tea_at_yahoogroups.com, "dkemnitz2000" <dkemnitz2000@y...>
>   wrote:
>
>   > > As far as the specs, it says it right there in CTTF.
>   > >
>   > I know they're there .Da!!!!!!Read my questions,then answer if you
>   > have it,don't delete them and think they've gone away.....How did
>   you
>   > arrive at that number? Why? What's so hard about that question?
>   > Apparently it was just pulled out of thin air. I Hate to speculate
>   or
>   > ass u me but I see CTTF has no answer. I only mostly asked fffor
>   > historical data.  Where's the science that you refer to on the home
>   > page of compost_tea? As in data,recipes,brewers,DO,pH,temp.,
>   etc.Test
>   > methods,specifics,data ,range,defect level,standard deviation,data,
>   > average,sampling
>   > technique,procedures,accuracy,precision,collaborative testing.  ACT
>   > was interesting until these regs arrived.  I see no science
>   involved
>   > in your CTTF spec regarding E.coli testing.   Someone wants us
>   > producers to pay for the data.   Now I did get close to ruffling my
>   > feathers! Anybody elses?      Dennis
>
>
>
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Received on Wed May 05 2004 - 13:03:36 EDT

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