RE: [pestlist] Math headache

2013-03-30 Thread Jones, Robert (Ryan) 
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All,

This thread brings good material to the surface - I will store it in my files. 
Before I researched this particular product, I had a very sketchy understanding 
of how laboratory testing (or lack thereof) was done in the infancy stages of 
developing pesticides. Your input on this has been greatthx for posting.

I will plan on reposting with the rest of the figures I have so my question 
will make more sense.

From: ad...@museumpests.net [mailto:ad...@museumpests.net] On Behalf Of 
abdul.r...@krepl.in
Sent: Saturday, March 30, 2013 3:54 AM
To: pestlist@museumpests.net
Subject: RE: [pestlist] Math headache

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Dear all,

In determining the  acceptable daily intake (ADI) in which you have shown an 
among 0f 0.16328 mg for a human being having 180 Ibs (equivalent to 81.64 Kg.). 
This figure of 0.16328 mg arrived at by 0.0002 x 81.64,. Generally ADI is 
calculated as NOEL (most sensitive species like dog/ safety factor which could 
be minimum 100 to even 500, multiplied by the average weight of adult human 
which could range from 60 kg to 80 kg. Similarly on children ADI is calculate 
on their average body weight.

Regarding your query , whether the amount 0.016328 mg equivalent to in ppm,  
will be the same as in case of solid/ liquid of solid/solid case the mg is 
equivalent to ppm.

Only in case of gaseous systems where the amount in a particular volume of gas/ 
air depends on pressure and temperature, hence it is not a fixed system and 
wherein ppm will not be the same as mg per liter. Generally in case of gaseous 
system ppm is converted to mg or vice versa by considering density of gas/air 
at particular temperature.

Hence in my opinion in case of human physical system which is perfectly a solid 
system, mg/kg will equivalent to ppm.



Regards.



Dr. Abdul Rauf


From: ad...@museumpests.net 
[mailto:ad...@museumpests.net] On Behalf Of Ellen Pearlstein
Sent: Saturday, March 30, 2013 10:59 AM
To: pestlist@museumpests.net
Subject: RE: [pestlist] Math headache

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Hi all,

It would not be typical for mg/kg to be equal to ppm, since the first is weight 
per weight, and the second is a count of one type of particle per total 
particles. The second (ppm) relies on the molecular weight of the gas and 
barometric pressure, since lighter particles under lower pressure disperse more 
readily resulting in fewer parts per million. With the name of the gaseous 
product you can likely look up the molecular weight; barometric pressure is 
often standardized at the normal atmospheric pressure at sea level which is 
1013 hPa (which equals 1013 mbar, 760 mm Hg, or 1 atmosphere). The latter bit 
of info comes from http://iaq.dk/index.html#index, Conversion Calculator for 
pollutants.

Do let us know what you figure out!

all best,

Ellen Pearlstein

From: rjo...@cwf.org
To: pestlist@museumpests.net
Subject: RE: [pestlist] Math headache
Date: Fri, 29 Mar 2013 22:36:58 +

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The risk of introduction is primarily ingestion, but it could be introduced 
dermally at a much lower level.

From: ad...@museumpests.net 
[mailto:ad...@museumpests.net] On Behalf Of 
bugma...@aol.com
Sent: Friday, March 29, 2013 6:33 PM
To: pestlist@museumpests.net
Subject: Re: [pestlist] Math headache

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Ryan -

What is the product, a gas being inhaled or something being swallowed??

Tom
-Original Message-
From: Jones, Robert (Ryan) (Ryan) mailto:rjo...@cwf.org>>
To: pestlist mailto:pestlist@museumpests.net>>
Sent: Fri, Mar 29, 2013 5:11 pm
Su

RE: [pestlist] Math headache

2013-03-30 Thread abdul.rauf 
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Dear all,

In determining the  acceptable daily intake (ADI) in which you have shown an
among 0f 0.16328 mg for a human being having 180 Ibs (equivalent to 81.64
Kg.). This figure of 0.16328 mg arrived at by 0.0002 x 81.64,. Generally ADI
is calculated as NOEL (most sensitive species like dog/ safety factor which
could be minimum 100 to even 500, multiplied by the average weight of adult
human which could range from 60 kg to 80 kg. Similarly on children ADI is
calculate on their average body weight.

Regarding your query , whether the amount 0.016328 mg equivalent to in ppm,
will be the same as in case of solid/ liquid of solid/solid case the mg is
equivalent to ppm.

Only in case of gaseous systems where the amount in a particular volume of
gas/ air depends on pressure and temperature, hence it is not a fixed system
and wherein ppm will not be the same as mg per liter. Generally in case of
gaseous system ppm is converted to mg or vice versa by considering density
of gas/air at particular temperature.

Hence in my opinion in case of human physical system which is perfectly a
solid system, mg/kg will equivalent to ppm. 

 

Regards.

 

Dr. Abdul Rauf

 

 

From: ad...@museumpests.net [mailto:ad...@museumpests.net] On Behalf Of
Ellen Pearlstein
Sent: Saturday, March 30, 2013 10:59 AM
To: pestlist@museumpests.net
Subject: RE: [pestlist] Math headache

 

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To post to this list send it as an email to pestlist@museumpests.net
To unsubscribe please look at the footer of this email.
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Hi all,

It would not be typical for mg/kg to be equal to ppm, since the first is
weight per weight, and the second is a count of one type of particle per
total particles. The second (ppm) relies on the molecular weight of the gas
and barometric pressure, since lighter particles under lower pressure
disperse more readily resulting in fewer parts per million. With the name of
the gaseous product you can likely look up the molecular weight; barometric
pressure is often standardized at the normal atmospheric pressure at sea
level which is 1013 hPa (which equals 1013 mbar, 760 mm Hg, or 1
atmosphere). The latter bit of info comes from
http://iaq.dk/index.html#index, Conversion Calculator for pollutants. 

Do let us know what you figure out!

all best,

Ellen Pearlstein

  _  

From: rjo...@cwf.org
To: pestlist@museumpests.net
Subject: RE: [pestlist] Math headache
Date: Fri, 29 Mar 2013 22:36:58 +

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The risk of introduction is primarily ingestion, but it could be introduced
dermally at a much lower level.  

 

From: ad...@museumpests.net [mailto:ad...@museumpests.net] On Behalf Of
bugma...@aol.com
Sent: Friday, March 29, 2013 6:33 PM
To: pestlist@museumpests.net
Subject: Re: [pestlist] Math headache

 

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To post to this list send it as an email to pestlist@museumpests.net
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Ryan -

 

What is the product, a gas being inhaled or something being swallowed??

 

Tom

-Original Message-
From: Jones, Robert (Ryan) (Ryan) 
To: pestlist 
Sent: Fri, Mar 29, 2013 5:11 pm
Subject: [pestlist] Math headache

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Group,

 

I am trying to determine the safe/unsafe exposure levels for a particular
product and am not sure my calculations are correct.

 

Here it is:

 

The estimate for acceptable daily intake for this product (I know.this is an
arbitrary figure to begin with) is .0002 mg/kg.

 

A 180 lb. human weighs 81.64 kg.

 

This makes the acceptable daily intake for that person .016328 mg.

 

Can this number be converted/translated into ppm?  There are some that claim
the answer would be .016328 ppm, and others say it is an impossible equation
because the only way this can be converted is with mg/liters.

 

Any thoughts? 

 

I just need a ballpark figure.

 

Thanks!

 

Ryan Jones

 

Integrated Pest Management 

Specialist  

 

Colonial_Williamsburg_Logo.jpg

P.O. Box 1776

Williamsburg, VA 23187

 

(757)  220-7080

 

rjo...@cwf.org 

 


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