Re: [compost_tea] DO meter calibration Question
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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