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Is 1 ppb equal to 1 μg/kg?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)How to determine the concentration after a dilution with Beer's law?What would be SMILES notation for a compound with delocalized bonding?Amount of substance of a molecule in a solute the same as amount of substance of constituent elements?Interpreting notation format 1.64E-02 from particulate emission dataWhat was the lithium concentration in 1940's 7-Up?Why are osmoles not considered SI units?Why is Ka constant when volume is increased?Should residual sodium be considered in measuring sodium content of sweat?Concentration of mercury in bodyConversion from a PPB value to µg/m3 of Isobutylene
$begingroup$
In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I thought that 1 μg/kg = 1 ppb.
Is 1 ppb equal to 1 μg/kg ? What is a reason to consider ppb as incorrect ?
concentration notation units
New contributor
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add a comment |
$begingroup$
In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I thought that 1 μg/kg = 1 ppb.
Is 1 ppb equal to 1 μg/kg ? What is a reason to consider ppb as incorrect ?
concentration notation units
New contributor
$endgroup$
add a comment |
$begingroup$
In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I thought that 1 μg/kg = 1 ppb.
Is 1 ppb equal to 1 μg/kg ? What is a reason to consider ppb as incorrect ?
concentration notation units
New contributor
$endgroup$
In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I thought that 1 μg/kg = 1 ppb.
Is 1 ppb equal to 1 μg/kg ? What is a reason to consider ppb as incorrect ?
concentration notation units
concentration notation units
New contributor
New contributor
edited 3 hours ago
andselisk
19.2k662125
19.2k662125
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asked 3 hours ago
NakxNakx
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$begingroup$
You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
This clutters the manuscript with redundant notes and causes overall confusion.
IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:
Although ppm, ppb, ppt and alike are widely used in various applications of
analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).
$$
beginarraylllll
hline
textName & textSymbol & textValue & textExamples & textReplacement \
hline
ldots & & & & \
textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
& & & textvolume fraction of~varphi = 120~textppb & \
ldots & & & & \
hline
endarray
$$
References
- IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)
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$begingroup$
You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
This clutters the manuscript with redundant notes and causes overall confusion.
IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:
Although ppm, ppb, ppt and alike are widely used in various applications of
analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).
$$
beginarraylllll
hline
textName & textSymbol & textValue & textExamples & textReplacement \
hline
ldots & & & & \
textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
& & & textvolume fraction of~varphi = 120~textppb & \
ldots & & & & \
hline
endarray
$$
References
- IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)
$endgroup$
add a comment |
$begingroup$
You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
This clutters the manuscript with redundant notes and causes overall confusion.
IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:
Although ppm, ppb, ppt and alike are widely used in various applications of
analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).
$$
beginarraylllll
hline
textName & textSymbol & textValue & textExamples & textReplacement \
hline
ldots & & & & \
textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
& & & textvolume fraction of~varphi = 120~textppb & \
ldots & & & & \
hline
endarray
$$
References
- IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)
$endgroup$
add a comment |
$begingroup$
You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
This clutters the manuscript with redundant notes and causes overall confusion.
IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:
Although ppm, ppb, ppt and alike are widely used in various applications of
analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).
$$
beginarraylllll
hline
textName & textSymbol & textValue & textExamples & textReplacement \
hline
ldots & & & & \
textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
& & & textvolume fraction of~varphi = 120~textppb & \
ldots & & & & \
hline
endarray
$$
References
- IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)
$endgroup$
You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
This clutters the manuscript with redundant notes and causes overall confusion.
IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:
Although ppm, ppb, ppt and alike are widely used in various applications of
analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).
$$
beginarraylllll
hline
textName & textSymbol & textValue & textExamples & textReplacement \
hline
ldots & & & & \
textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
& & & textvolume fraction of~varphi = 120~textppb & \
ldots & & & & \
hline
endarray
$$
References
- IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)
edited 3 hours ago
answered 3 hours ago
andseliskandselisk
19.2k662125
19.2k662125
add a comment |
add a comment |
Nakx is a new contributor. Be nice, and check out our Code of Conduct.
Nakx is a new contributor. Be nice, and check out our Code of Conduct.
Nakx is a new contributor. Be nice, and check out our Code of Conduct.
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