Miau, a microbalance autosampler

Carvalho, Matheus Carvalho de

doi:10.1016/j.ohx.2021.e00215

Cited by 7 publications

(8 citation statements)

References 23 publications

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“…The autosampler used here is a cartesian robot with a syringe as end‐effector, similar to previous ones presented for other purposes 33–35 . The syringe has a capacity of 10 ml and is connected to a 20‐cm long, 2‐mm diameter needle (sampling needle in Figure 1).…”

Section: Methodsmentioning

confidence: 99%

“…The autosampler used here is a cartesian robot with a syringe as endeffector, similar to previous ones presented for other purposes. [33][34][35] The syringe has a capacity of 10 ml and is connected to a 20-cm long, 2-mm diameter needle (sampling needle in Figure 1). A 1/8 00 gas line is attached to the sampling needle so that when it penetrates the sample, N 2 gas (from the Nafion dryer outlet) can be used to purge gaseous dissolved inorganic carbon (DIC).…”

Section: Autosamplermentioning

confidence: 99%

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Adapting an elemental analyser to perform high‐temperature catalytic oxidation for dissolved organic carbon measurements in water

Carvalho

2022

Rapid Comm Mass Spectrometry

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Rationale Many laboratories employ elemental analyzers (EAs) coupled to isotope ratio mass spectrometers (IRMSs) to measure carbon stable isotope ratios (δ13C) in solid samples. Dissolved organic carbon (DOC) in most natural water samples cannot be analyzed using this approach unless time‐consuming preconcentration is employed. Methods An EA‐IRMS can be used to measure DOC δ13C in natural waters without the need for sample preconcentration by employing high‐temperature catalytic oxidation. An autosampler injects water into the EA reactor at 680°C filled with platinum catalyst beads, where all carbon is converted to CO2. Remaining water and halides are removed, while CO2 is trapped in a cryotrap and later released to the IRMS. Results Measurements were accurate (deviation <0.3‰ compared to solid sample measurements) and precise (error of 0.3‰ for concentrations ≥46 μM). Blanks were present and accounted for. Salinity up to seawater level did not affect accuracy or precision, but limited the number of samples that could be run before cleaning of the reactor was needed. DOC δ13C in a river/estuary varied between −25.7 and −23.2‰, with higher values for waters with higher salinity, as expected. Deep‐sea water reference material had a value of −22.9 ± 0.5‰, very similar to those found in recent reports employing similar techniques. Conclusion Adapting an EA is a feasible approach for the measurement of DOC δ13C in natural waters. The low cost and simplicity of the system allow its use in any laboratory already equipped with EA‐IRMS.

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Section: Methodsmentioning

confidence: 99%

Section: Autosamplermentioning

confidence: 99%

Adapting an elemental analyser to perform high‐temperature catalytic oxidation for dissolved organic carbon measurements in water

Carvalho

2022

Rapid Comm Mass Spectrometry

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“…In fact, in the last few years, some open hardware appeared in the scientific literature. Application covers basic laboratory procedures like liquid manipulation [1] , microextraction [2] , auto sampling [3] , [4] and weighing [5] just to cite some. Also, more complex frameworks including modular workstations are present [6] , [7] , [8] .…”

Section: Hardware In Contextmentioning

confidence: 99%

Mostly 3D printed chemical synthesis robot

et al. 2022

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“…Marlin is widespread in Open Hardware projects for motion control. It has been used for sampling [29] , [30] , [31] , positioning in neurophysiology research [32] as well as automated planar chromatography [33] . Using Marlin in this project avoids the need of programming the pumps from scratch, using microcontrollers like Arduino or the Linux based Raspberry Pi.…”

Section: Hardware In Contextmentioning

confidence: 99%

Ender3 3D printer kit transformed into open, programmable syringe pump set

Baas

Saggiomo

2021

HardwareX

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A cheap, open source 3D printer (Creality Ender 3) is transformed into an Open Hardware, programmable syringe pump set. Only 3 parts need to be purchased outside of the printer kit. All other parts are either in the Ender 3 kit, or can be 3D printed. No prior knowledge in electronics or programming languages is required. The pumps are controlled by the 3D printer firmware and motherboard and programmed in simple G-code text files. The total cost of a three pumps setup is $€170. The pumps are capable of reaching stable flows down to 5 mL/min using cheap, disposable 10 mL syringes. Higher flow speeds are also achievable, in the order of mL/min.

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Miau, a microbalance autosampler

Cited by 7 publications

References 23 publications

Adapting an elemental analyser to perform high‐temperature catalytic oxidation for dissolved organic carbon measurements in water

Adapting an elemental analyser to perform high‐temperature catalytic oxidation for dissolved organic carbon measurements in water

Mostly 3D printed chemical synthesis robot

Ender3 3D printer kit transformed into open, programmable syringe pump set

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