Does ultrasonic bath cleaning damage laboratory volumetric glassware calibration?How to get meniscus down to...
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Does ultrasonic bath cleaning damage laboratory volumetric glassware calibration?
How to get meniscus down to the calibration mark with a volumetric pipette
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As an analytical chemist, I'm always ensuring my glassware is thoroughly clean before I start an analysis. However, my supervisor always states that using ultrasonic bath to clean volumetric glassware damages its calibration, rendering it imprecise for analytical usage. Does that hold true, or is it okay to use an ultrasonic cleaner?
experimental-chemistry analytical-chemistry
asked 8 hours ago
RomanRoman
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Roman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
$begingroup$
As an analytical chemist, I'm always ensuring my glassware is thoroughly clean before I start an analysis. However, my supervisor always states that using ultrasonic bath to clean volumetric glassware damages its calibration, rendering it imprecise for analytical usage. Does that hold true, or is it okay to use an ultrasonic cleaner?
experimental-chemistry analytical-chemistry
asked 8 hours ago
RomanRoman
311 bronze badge
New contributor
Roman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
2
$begingroup$
Unless it fractured the glassware I don’t see the issue.
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
I sometimes sonicate volumetrics to help dissolution for a short period. However, I am actually curious about the following test, which I vaguely recall (and therefore could be wrong). If we make up the volume exactly to mark, and then sonicate, what happens to meniscus? It goes down slightly below the mark temporarily. This could be from local heating of the glass. Glass and solutions do heat up during sonication.
$endgroup$
– M. Farooq
44 mins ago
add a comment |
$begingroup$
As an analytical chemist, I'm always ensuring my glassware is thoroughly clean before I start an analysis. However, my supervisor always states that using ultrasonic bath to clean volumetric glassware damages its calibration, rendering it imprecise for analytical usage. Does that hold true, or is it okay to use an ultrasonic cleaner?
experimental-chemistry analytical-chemistry
asked 8 hours ago
RomanRoman
311 bronze badge
New contributor
Roman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
As an analytical chemist, I'm always ensuring my glassware is thoroughly clean before I start an analysis. However, my supervisor always states that using ultrasonic bath to clean volumetric glassware damages its calibration, rendering it imprecise for analytical usage. Does that hold true, or is it okay to use an ultrasonic cleaner?
experimental-chemistry analytical-chemistry
experimental-chemistry analytical-chemistry
asked 8 hours ago
RomanRoman
311 bronze badge
New contributor
Roman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
RomanRoman
311 bronze badge
New contributor
Roman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
RomanRoman
311 bronze badge
New contributor
Roman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
RomanRoman
311 bronze badge
asked 8 hours ago
RomanRoman
311 bronze badge
311 bronze badge
New contributor
Roman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Roman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
$begingroup$
Unless it fractured the glassware I don’t see the issue.
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
I sometimes sonicate volumetrics to help dissolution for a short period. However, I am actually curious about the following test, which I vaguely recall (and therefore could be wrong). If we make up the volume exactly to mark, and then sonicate, what happens to meniscus? It goes down slightly below the mark temporarily. This could be from local heating of the glass. Glass and solutions do heat up during sonication.
$endgroup$
– M. Farooq
44 mins ago
add a comment |
2
$begingroup$
Unless it fractured the glassware I don’t see the issue.
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
I sometimes sonicate volumetrics to help dissolution for a short period. However, I am actually curious about the following test, which I vaguely recall (and therefore could be wrong). If we make up the volume exactly to mark, and then sonicate, what happens to meniscus? It goes down slightly below the mark temporarily. This could be from local heating of the glass. Glass and solutions do heat up during sonication.
$endgroup$
– M. Farooq
44 mins ago
2
2
$begingroup$
Unless it fractured the glassware I don’t see the issue.
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
Unless it fractured the glassware I don’t see the issue.
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
I sometimes sonicate volumetrics to help dissolution for a short period. However, I am actually curious about the following test, which I vaguely recall (and therefore could be wrong). If we make up the volume exactly to mark, and then sonicate, what happens to meniscus? It goes down slightly below the mark temporarily. This could be from local heating of the glass. Glass and solutions do heat up during sonication.
$endgroup$
– M. Farooq
44 mins ago
$begingroup$
I sometimes sonicate volumetrics to help dissolution for a short period. However, I am actually curious about the following test, which I vaguely recall (and therefore could be wrong). If we make up the volume exactly to mark, and then sonicate, what happens to meniscus? It goes down slightly below the mark temporarily. This could be from local heating of the glass. Glass and solutions do heat up during sonication.
$endgroup$
– M. Farooq
44 mins ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
According to technical information for volumetric measurement provided by Brand, it is acceptable to use an ultrasonic bath.
Both glass and plastic labware may be cleaned in an ultrasonic bath. However, direct contact with the sonic membranes must be avoided.
Nevertheless,
For gentle treatment of labware, clean immediately after use – at low temperatures, with brief soaking times, and at low alkalinity. Glass volumetric instruments should not be exposed to prolonged immersion times in alkaline media above 70 °C, as such treatment causes volume changes through glass corrosion, and destruction of graduations.
answered 7 hours ago
Loong♦Loong
35.3k8 gold badges88 silver badges190 bronze badges
$endgroup$
add a comment |
$begingroup$
If your supervisor is unconvinced by Brand's guidance on this (as supplied by Loong in his answer), you could always test the effect of ultrasonic cleaning directly:
Take, say, six volumetric flasks, and weigh the amount of water each holds when filled to the line. Then subject three to several cycles of ultrasonic cleaning (the other three can be left to sit in the ultrasonic cleaning solution, but without turning the machine on), dry all six, and repeat the weighing measurement. Determine if the before-and-after difference for the ultrasonically cleaned flasks is significantly different from that seen in the control flasks.
While the control flasks do control for temperature differences between the before-and-after measurements, it would be cleaner if you could do the before-and-after measurements at the same temperature. That way the only difference you see should be random experimental error plus any systematic differences due to cleaning.
answered 3 hours ago
theoristtheorist
33310 bronze badges
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2 Answers
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$begingroup$
According to technical information for volumetric measurement provided by Brand, it is acceptable to use an ultrasonic bath.
Both glass and plastic labware may be cleaned in an ultrasonic bath. However, direct contact with the sonic membranes must be avoided.
Nevertheless,
For gentle treatment of labware, clean immediately after use – at low temperatures, with brief soaking times, and at low alkalinity. Glass volumetric instruments should not be exposed to prolonged immersion times in alkaline media above 70 °C, as such treatment causes volume changes through glass corrosion, and destruction of graduations.
answered 7 hours ago
Loong♦Loong
35.3k8 gold badges88 silver badges190 bronze badges
$endgroup$
add a comment |
$begingroup$
According to technical information for volumetric measurement provided by Brand, it is acceptable to use an ultrasonic bath.
Both glass and plastic labware may be cleaned in an ultrasonic bath. However, direct contact with the sonic membranes must be avoided.
Nevertheless,
For gentle treatment of labware, clean immediately after use – at low temperatures, with brief soaking times, and at low alkalinity. Glass volumetric instruments should not be exposed to prolonged immersion times in alkaline media above 70 °C, as such treatment causes volume changes through glass corrosion, and destruction of graduations.
answered 7 hours ago
Loong♦Loong
35.3k8 gold badges88 silver badges190 bronze badges
$endgroup$
add a comment |
$begingroup$
According to technical information for volumetric measurement provided by Brand, it is acceptable to use an ultrasonic bath.
Both glass and plastic labware may be cleaned in an ultrasonic bath. However, direct contact with the sonic membranes must be avoided.
Nevertheless,
For gentle treatment of labware, clean immediately after use – at low temperatures, with brief soaking times, and at low alkalinity. Glass volumetric instruments should not be exposed to prolonged immersion times in alkaline media above 70 °C, as such treatment causes volume changes through glass corrosion, and destruction of graduations.
answered 7 hours ago
Loong♦Loong
35.3k8 gold badges88 silver badges190 bronze badges
$endgroup$
According to technical information for volumetric measurement provided by Brand, it is acceptable to use an ultrasonic bath.
Both glass and plastic labware may be cleaned in an ultrasonic bath. However, direct contact with the sonic membranes must be avoided.
Nevertheless,
For gentle treatment of labware, clean immediately after use – at low temperatures, with brief soaking times, and at low alkalinity. Glass volumetric instruments should not be exposed to prolonged immersion times in alkaline media above 70 °C, as such treatment causes volume changes through glass corrosion, and destruction of graduations.
answered 7 hours ago
Loong♦Loong
35.3k8 gold badges88 silver badges190 bronze badges
answered 7 hours ago
Loong♦Loong
35.3k8 gold badges88 silver badges190 bronze badges
answered 7 hours ago
Loong♦Loong
35.3k8 gold badges88 silver badges190 bronze badges
answered 7 hours ago
Loong♦Loong
35.3k8 gold badges88 silver badges190 bronze badges
35.3k8 gold badges88 silver badges190 bronze badges
add a comment |
add a comment |
$begingroup$
If your supervisor is unconvinced by Brand's guidance on this (as supplied by Loong in his answer), you could always test the effect of ultrasonic cleaning directly:
Take, say, six volumetric flasks, and weigh the amount of water each holds when filled to the line. Then subject three to several cycles of ultrasonic cleaning (the other three can be left to sit in the ultrasonic cleaning solution, but without turning the machine on), dry all six, and repeat the weighing measurement. Determine if the before-and-after difference for the ultrasonically cleaned flasks is significantly different from that seen in the control flasks.
While the control flasks do control for temperature differences between the before-and-after measurements, it would be cleaner if you could do the before-and-after measurements at the same temperature. That way the only difference you see should be random experimental error plus any systematic differences due to cleaning.
answered 3 hours ago
theoristtheorist
33310 bronze badges
$endgroup$
add a comment |
$begingroup$
If your supervisor is unconvinced by Brand's guidance on this (as supplied by Loong in his answer), you could always test the effect of ultrasonic cleaning directly:
Take, say, six volumetric flasks, and weigh the amount of water each holds when filled to the line. Then subject three to several cycles of ultrasonic cleaning (the other three can be left to sit in the ultrasonic cleaning solution, but without turning the machine on), dry all six, and repeat the weighing measurement. Determine if the before-and-after difference for the ultrasonically cleaned flasks is significantly different from that seen in the control flasks.
While the control flasks do control for temperature differences between the before-and-after measurements, it would be cleaner if you could do the before-and-after measurements at the same temperature. That way the only difference you see should be random experimental error plus any systematic differences due to cleaning.
answered 3 hours ago
theoristtheorist
33310 bronze badges
$endgroup$
add a comment |
$begingroup$
If your supervisor is unconvinced by Brand's guidance on this (as supplied by Loong in his answer), you could always test the effect of ultrasonic cleaning directly:
Take, say, six volumetric flasks, and weigh the amount of water each holds when filled to the line. Then subject three to several cycles of ultrasonic cleaning (the other three can be left to sit in the ultrasonic cleaning solution, but without turning the machine on), dry all six, and repeat the weighing measurement. Determine if the before-and-after difference for the ultrasonically cleaned flasks is significantly different from that seen in the control flasks.
While the control flasks do control for temperature differences between the before-and-after measurements, it would be cleaner if you could do the before-and-after measurements at the same temperature. That way the only difference you see should be random experimental error plus any systematic differences due to cleaning.
answered 3 hours ago
theoristtheorist
33310 bronze badges
$endgroup$
If your supervisor is unconvinced by Brand's guidance on this (as supplied by Loong in his answer), you could always test the effect of ultrasonic cleaning directly:
Take, say, six volumetric flasks, and weigh the amount of water each holds when filled to the line. Then subject three to several cycles of ultrasonic cleaning (the other three can be left to sit in the ultrasonic cleaning solution, but without turning the machine on), dry all six, and repeat the weighing measurement. Determine if the before-and-after difference for the ultrasonically cleaned flasks is significantly different from that seen in the control flasks.
While the control flasks do control for temperature differences between the before-and-after measurements, it would be cleaner if you could do the before-and-after measurements at the same temperature. That way the only difference you see should be random experimental error plus any systematic differences due to cleaning.
answered 3 hours ago
theoristtheorist
33310 bronze badges
edited 2 hours ago
answered 3 hours ago
theoristtheorist
33310 bronze badges
answered 3 hours ago
theoristtheorist
33310 bronze badges
answered 3 hours ago
theoristtheorist
33310 bronze badges
33310 bronze badges
add a comment |
add a comment |
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2
$begingroup$
Unless it fractured the glassware I don’t see the issue.
$endgroup$
– Jon Custer
7 hours ago
$begingroup$
I sometimes sonicate volumetrics to help dissolution for a short period. However, I am actually curious about the following test, which I vaguely recall (and therefore could be wrong). If we make up the volume exactly to mark, and then sonicate, what happens to meniscus? It goes down slightly below the mark temporarily. This could be from local heating of the glass. Glass and solutions do heat up during sonication.
$endgroup$
– M. Farooq
44 mins ago