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Is 1 ppb equal to 1 μg/kg?
Announcing the arrival of Valued Associate #679: Cesar Manara
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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
edited 2 hours ago
andselisk
19.2k662125
asked 2 hours ago
NakxNakx
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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
edited 2 hours ago
andselisk
19.2k662125
asked 2 hours ago
NakxNakx
1134
New contributor
Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
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
edited 2 hours ago
andselisk
19.2k662125
asked 2 hours ago
NakxNakx
1134
New contributor
Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
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
edited 2 hours ago
andselisk
19.2k662125
asked 2 hours ago
NakxNakx
1134
New contributor
Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 hours ago
andselisk
19.2k662125
asked 2 hours ago
NakxNakx
1134
New contributor
Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 hours ago
andselisk
19.2k662125
edited 2 hours ago
andselisk
19.2k662125
edited 2 hours ago
andselisk
19.2k662125
19.2k662125
asked 2 hours ago
NakxNakx
1134
New contributor
Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
NakxNakx
1134
asked 2 hours ago
NakxNakx
1134
1134
New contributor
Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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1 Answer
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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.).
$$
begin{array}{lllll}
hline
text{Name} & text{Symbol} & text{Value} & text{Examples} & text{Replacement} \
hline
ldots & & & & \
text{part per billion} & text{ppb} & 10^{-9} & text{The air quality standard for ozone is a} & pu{mmol/mol} \
& & & text{volume fraction of}~varphi = 120~text{ppb} & \
ldots & & & & \
hline
end{array}
$$
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)
answered 2 hours ago
andseliskandselisk
19.2k662125
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1 Answer
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1 Answer
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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.).
$$
begin{array}{lllll}
hline
text{Name} & text{Symbol} & text{Value} & text{Examples} & text{Replacement} \
hline
ldots & & & & \
text{part per billion} & text{ppb} & 10^{-9} & text{The air quality standard for ozone is a} & pu{mmol/mol} \
& & & text{volume fraction of}~varphi = 120~text{ppb} & \
ldots & & & & \
hline
end{array}
$$
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)
answered 2 hours ago
andseliskandselisk
19.2k662125
$endgroup$
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.).
$$
begin{array}{lllll}
hline
text{Name} & text{Symbol} & text{Value} & text{Examples} & text{Replacement} \
hline
ldots & & & & \
text{part per billion} & text{ppb} & 10^{-9} & text{The air quality standard for ozone is a} & pu{mmol/mol} \
& & & text{volume fraction of}~varphi = 120~text{ppb} & \
ldots & & & & \
hline
end{array}
$$
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)
answered 2 hours ago
andseliskandselisk
19.2k662125
$endgroup$
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.).
$$
begin{array}{lllll}
hline
text{Name} & text{Symbol} & text{Value} & text{Examples} & text{Replacement} \
hline
ldots & & & & \
text{part per billion} & text{ppb} & 10^{-9} & text{The air quality standard for ozone is a} & pu{mmol/mol} \
& & & text{volume fraction of}~varphi = 120~text{ppb} & \
ldots & & & & \
hline
end{array}
$$
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)
answered 2 hours ago
andseliskandselisk
19.2k662125
$endgroup$
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.).
$$
begin{array}{lllll}
hline
text{Name} & text{Symbol} & text{Value} & text{Examples} & text{Replacement} \
hline
ldots & & & & \
text{part per billion} & text{ppb} & 10^{-9} & text{The air quality standard for ozone is a} & pu{mmol/mol} \
& & & text{volume fraction of}~varphi = 120~text{ppb} & \
ldots & & & & \
hline
end{array}
$$
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)
answered 2 hours ago
andseliskandselisk
19.2k662125
edited 2 hours ago
answered 2 hours ago
andseliskandselisk
19.2k662125
answered 2 hours ago
andseliskandselisk
19.2k662125
answered 2 hours ago
andseliskandselisk
19.2k662125
19.2k662125
add a comment |
add a comment |
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