Wrecking Bereserker
Harmless
Posts: 25
Registered: 2-4-2019
Member Is Offline
|
|
Parts per notation
I know what it is and how to do calculations with it
But whenever i read say 10ppm is the chlorine lethal dosage level im unable to process it in a real life scenery or understand what should it mean to
someone producing the gas for example if someone says 1 liter i imagine a 1liter bottle filled with it but what about ppm?
|
|
|
MrHomeScientist
International Hazard
Posts: 1806
Registered: 24-10-2010
Location: Flerovium
Member Is Offline
Mood: No Mood
|
|
Well ppm is 10-6, so for your 1 liter bottle example you'd have 1 mL of contaminant in that volume.
So then your "lethal bottle" of chlorine would have 10 mL of pure chlorine mixed in there with the 1 L of air. Catching a whiff of the contents won't
kill you, but inhaling the whole bottle might. Either way it'll definitely be unpleasant.
|
|
|
mayko
International Hazard
Posts: 1218
Registered: 17-1-2013
Location: Carrboro, NC
Member Is Offline
Mood: anomalous (Euclid class)
|
|
(a millionth of a liter is a microliter, uL  )
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
|
|
|
Sulaiman
International Hazard
Posts: 3558
Registered: 8-2-2015
Location: 3rd rock from the sun
Member Is Online
|
|
Quote: Originally posted by MrHomeScientist  | Well ppm is 10-6, so for your 1 liter bottle example you'd have 1 mL of contaminant in that volume.
So then your "lethal bottle" of chlorine would have 10 mL of pure chlorine mixed in there with the 1 L of air. Catching a whiff of the contents won't
kill you, but inhaling the whole bottle might. Either way it'll definitely be unpleasant. |
1ppm = 1 litre / 1,000,000 = 1 ul
if 1 ppm = 1ml then the total volume is 1000 litres, one cubic metre.
10ml @ 1ppm = 10 m3 = room size
CAUTION : Hobby Chemist, not Professional or even Amateur
|
|
|
Wrecking Bereserker
Harmless
Posts: 25
Registered: 2-4-2019
Member Is Offline
|
|
| Quote: Originally posted by Sulaiman | | Quote: Originally posted by MrHomeScientist | Well ppm is 10-6, so for your 1 liter bottle example you'd have 1 mL of contaminant in that volume.
So then your "lethal bottle" of chlorine would have 10 mL of pure chlorine mixed in there with the 1 L of air. Catching a whiff of the contents won't
kill you, but inhaling the whole bottle might. Either way it'll definitely be unpleasant. |
1ppm = 1 litre / 1,000,000 = 1 ul
if 1 ppm = 1ml then the total volume is 1000 litres, one cubic metre.
10ml @ 1ppm = 10 m3 = room size |
So that means if i were to take 1litre bottle then 10 ppm will be 0.01ml right?
|
|
|
Metacelsus
International Hazard
Posts: 2531
Registered: 26-12-2012
Location: Boston, MA
Member Is Offline
Mood: Double, double, toil and trouble
|
|
Yes.
|
|
|
MrHomeScientist
International Hazard
Posts: 1806
Registered: 24-10-2010
Location: Flerovium
Member Is Offline
Mood: No Mood
|
|
Damn, that's what I get for blindly copying Wikipedia: "The quantity “1 ppm” can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of
sample solution. When working with aqueous solutions, it is common to assume that the density of water is 1.00 g/mL. Therefore, it is common to equate
1 kilogram of water with 1 L of water. Consequently, 1 ppm corresponds to 1 mg/L and 1 ppb corresponds to 1 μg/L."
|
|
|
wg48temp9
National Hazard
Posts: 761
Registered: 30-12-2018
Location: not so United Kingdom
Member Is Offline
|
|
| Quote: Originally posted by Wrecking Bereserker | I know what it is and how to do calculations with it
But whenever i read say 10ppm is the chlorine lethal dosage level im unable to process it in a real life scenery or understand what should it mean to
someone producing the gas for example if someone says 1 liter i imagine a 1liter bottle filled with it but what about ppm? |
As usual or frequently you need to look at the context or additional info of any number. See the pararaph below for example, taken from wiki https://en.wikipedia.org/wiki/Chlorine_gas_poisoning.
"Dose toxicity
Humans can smell chlorine gas at ranges from 0.1–0.3 ppm. According to a review from 2010: "At 1–3 ppm, there is mild mucus membrane irritation
that can usually be tolerated for about an hour. At 5–15 ppm, there is moderate mucus membrane irritation. At 30 ppm and beyond, there is immediate
chest pain, shortness of breath, and cough. At approximately 40–60 ppm, a toxic pneumonitis and/or acute pulmonary edema can develop....
Concentrations of about 400 ppm and beyond are generally fatal over 30 minutes, and at 1,000 ppm and above, fatality ensues within only a few
minutes."
As you can see the ppm refers to the concentration in inhaled air for a particular amount of time.
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
|
|
|
happyfooddance
National Hazard
Posts: 530
Registered: 9-11-2017
Location: Los Angeles, Ca.
Member Is Offline
Mood: No Mood
|
|
But we are talking about concentrations of gas, if we were to assume the rest of the liter is filled with water this calculation would be correct. 1
liter of water weighs 1kg, but 1 liter of air weighs far less.
Gasses are sometimes measured in mass fraction and sometimes in mol fraction, sometimes in mass/volume, depending on your use... And you may need to
convert between and will need to apply partial pressures and universal gas constant, etc...
[Edited on 4-4-2019 by happyfooddance]
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
