Simple mercury expansion regulator for control of air temperatures to  0.02 deg C

Butcher, K. L.; Byrne, Melissa

doi:10.1088/0950-7671/38/2/408

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…Techniques such as atomic absorption spectrometry (AAS) [ 14,15 ] and inductively coupled plasma optical emission spectrometry (ICP‐OES) [ 16 ] or inductively coupled plasma mass spectroscopy (ICP‐MS) have been used for analyzing heavy metals in environmental samples. [ 17 ] Nowadays, Total Reflection X‐Ray fluorescence (TXRF) is a competitive analytical technique because of its practicality, accuracy and reliability.…”

Section: Introductionmentioning

confidence: 99%

Multielemental analysis by total reflection X‐ray fluorescence spectrometry and phytochelatins determination in aquatic plants

et al. 2021

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Although heavy‐metal biomonitoring in aquatic environments has been traditionally based on chemical analyses, these do not reflect the impact on organisms; because of this, international environmental agencies have proposed the use of biomarkers. In this study Cr, Ni, Cu, Zn and Pb were bio‐monitored in different species of aquatic plants using Total Reflection X‐Ray Fluorescence (TXRF) spectrometry. The relation between each metal with phytochelatins (PCs) was also assessed in order to establish the use of PCs as biomarkers for water pollution contaminants. Samples of Lemna gibba, Myriophyllum heterophyllum, Arenaria paludicola, Hydrocotyle ranunculoides and Eichhornia crassipes collected in natural aquatic environment were analyzed. The results showed significant differences in metal concentration between species both in shoots and roots: Cr, Ni, Cu and Pb were greater in roots in the majority of samples; the maximum content of Pb (7.92 mg/kg) was found in roots of E. crassipes, Cr (7.54 mg/kg), Ni (5.96 mg/kg) in roots and Zn (64.10 mg/kg) and Cu (60.55 mg/kg) in shoots of H. ranunculoides, which showed the heaviest metal concentration. Glutathione (GSH) and the PCs concentrations were also ascertained. Differences between species and parts of the plants were also found, although the tendency was different as regards elemental concentration. Marked differences were detected in metal absorption and sensitivity to produce PCs of the aquatic plants. Pb was the metal with the least concentration in the plants, but, it was the only element that showed a direct correlation (p < 0.05, r > 0.9) with the PCs induction.

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Section: Introductionmentioning

confidence: 99%

Multielemental analysis by total reflection X‐ray fluorescence spectrometry and phytochelatins determination in aquatic plants

et al. 2021

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“…Several methods are widely used for identification and quantification of heavy metals, including colorimetry, atomic absorption spectroscopy (AAS), inductively coupled plasma atomic emission spectroscopy (ICP-AES), inductively coupled plasma mass spectroscopy (ICPMS), and so on. − Although these methods are capable of achieving highly sensitive detection, identification and quantification of heavy metals, they always require the support of well-equipped laboratories and skilled operators, which can be very expensive. Therefore, alternative and inexpensive methods are in demand for field-based or on-site water monitoring by personnel with limited training or even unskilled home-users.…”

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confidence: 99%

“Periodic-Table-Style” Paper Device for Monitoring Heavy Metals in Water

et al. 2015

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If a paper-based analytical device (μ-PAD) could be made by printing indicators for detection of heavy metals in chemical symbols of the metals in a style of the periodic table of elements, it could be possible for such μ-PAD to report the presence and the safety level of heavy metal ions in water simultaneously and by text message. This device would be able to provide easy solutions to field-based monitoring of heavy metals in industrial wastewater discharges and in irrigating and drinking water. Text-reporting could promptly inform even nonprofessional users of the water quality. This work presents a proof of concept study of this idea. Cu(II), Ni(II), and Cr(VI) were chosen to demonstrate the feasibility, specificity, and reliability of paper-based text-reporting devices for monitoring heavy metals in water.

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“…Several methods exist for identification and quantification of heavy metals, including inductively coupled plasma/atomic emission spectrometry (ICP/AES), inductively coupled plasma mass spectrometry (ICPMS), atomic absorption spectroscopy (AAS), as well as various wet chemical methods (titrimetry, gravimetry, colorimetric assays, etc). − Though many of these methods are ultrasensitive and relatively accurate, they require significant time and money, particularly when large numbers of samples require testing, and are generally not amenable to on-site testing by unskilled personnel.…”

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confidence: 99%

β-Galactosidase-Based Colorimetric Paper Sensor for Determination of Heavy Metals

2011

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We demonstrate a novel approach for rapid, selective, and sensitive detection of heavy metals using a solid-phase bioactive lab-on-paper sensor that is inkjet printed with sol-gel entrapped reagents to allow colorimetric visualization of the enzymatic activity of β-galactosidase (B-GAL). The bioactive paper assay is able to detect a range of heavy metals, either alone or as mixtures, in as little as 10 min, with detection limits as follows: Hg(II) = 0.001 ppm; Ag(I) = 0.002 ppm, Cu(II) = 0.020 ppm; Cd(II) = 0.020 ppm; Pb(II) = 0.140 ppm; Cr(VI) = 0.150 ppm; Ni(II) = 0.230 ppm. The paper-based assay was immune to interferences from nontoxic metal ions such as Na(+) or K(+), could be used to detect heavy metals that were spiked into tap water or lake water, and provided quantitative data that was in agreement with values obtained by atomic absorption. With the incorporation of standard chromogenic metal sensing reagents into a multiplexed bioactive paper sensor, it was possible to identify specific metals in mixtures, albeit with much lower detection limits than were obtained with the enzymatic assay. The paper-based sensor should be valuable for rapid, on-site screening of trace levels of heavy metals in resource limited areas and developing countries.

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Simple mercury expansion regulator for control of air temperatures to 0.02 deg C

Cited by 3 publications

References 2 publications

Multielemental analysis by total reflection X‐ray fluorescence spectrometry and phytochelatins determination in aquatic plants

Multielemental analysis by total reflection X‐ray fluorescence spectrometry and phytochelatins determination in aquatic plants

“Periodic-Table-Style” Paper Device for Monitoring Heavy Metals in Water

β-Galactosidase-Based Colorimetric Paper Sensor for Determination of Heavy Metals

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