Stand-off and up-close Raman detection of nitrates buried in sand and soils

Farley, Carlton; Sadate, Sandra; Kassu, Aschalew; Monono, Belther; Witt, William W.; Bibb, Jonathan; Sharma, Anup

doi:10.1117/12.2062184

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…Standoff Raman spectroscopy involves analyzing samples from distances of a few centimeters up to hundreds of meters 1 and has recently proven to be a very valuable tool in the detection of explosives, [1][2][3][4][5] pollutants in the atmosphere 6,7 and in water, 8,9 as well as minerals, [10][11][12] but has not been utilized in the area of food defense. To the best of our knowledge, this is the first reported use of standoff Raman spectroscopy as a viable detection technique for EMA.…”

Section: Introductionmentioning

confidence: 99%

Short Distance Standoff Raman Detection of Extra Virgin Olive Oil Adulterated with Canola and Grapeseed Oils

et al. 2016

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A short distance standoff Raman technique is demonstrated for detecting economically motivated adulteration (EMA) in extra virgin olive oil (EVOO). Using a portable Raman spectrometer operating with a 785 nm laser and a 2-in. refracting telescope, adulteration of olive oil with grapeseed oil and canola oil is detected between 1% and 100% at a minimum concentration of 2.5% from a distance of 15 cm and at a minimum concentration of 5% from a distance of 1 m. The technique involves correlating the intensity ratios of prominent Raman bands of edible oils at 1254, 1657, and 1441 cm to the degree of adulteration. As a novel variation in the data analysis technique, integrated intensities over a spectral range of 100 cm around the Raman line were used, making it possible to increase the sensitivity of the technique. The technique is demonstrated by detecting adulteration of EVOO with grapeseed and canola oils at 0-100%. Due to the potential of this technique for making measurements from a convenient distance, the short distance standoff Raman technique has the promise to be used for routine applications in food industry such as identifying food items and monitoring EMA at various checkpoints in the food supply chain and storage facilities.

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Section: Introductionmentioning

confidence: 99%

Short Distance Standoff Raman Detection of Extra Virgin Olive Oil Adulterated with Canola and Grapeseed Oils

et al. 2016

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Homogeneous Metal Nitrate Hydroxide Nanoarrays Grown on Nickel Foam for Efficient Electrocatalytic Oxygen Evolution

Chu

et al. 2018

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Developing facile routes for fabricating highly efficient oxygen evolution reaction (OER) electrocatalysts is in great demand but remains a great challenge. Herein, a novel molten salt decomposition method to prepare 3D metal nitrate hydroxide (MNH, M = Ni, Co, and Cu) nanoarrays homogenously grown on different conductive substrates, especially on nickel foam (NF) for OER applications, is reported. Compared with the as‐prepared CoNH/NF and CuNH/NF, NiNH/NF presents a superior electrocatalytic OER activity and stability in an alkaline solution, with a very low overpotential of only 231 mV versus a reversible hydrogen electrode to deliver a geometrical catalytic current density of 50 mA cm−2 and a low Tafel slope of 81 mV dec−1, outperforming most reported transition metal compound catalysts. Structural investigation after the OER process reveals the morphology integrity of the nanoarrays but the formation of metal oxyhydroxide (for NiNH and CoNH) or oxide (for CuNH) as the likely real active species. These metal nitrate hydroxide non‐noble metal electrocatalysts can be prepared by an economical and simple method, with enhanced intrinsic activity and long‐term stability and durability, which might be new candidates for energy conversion and storage applications.

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Nitrate induced precise atom substitution and vacancies for overall water splitting

Zhou

Dong

et al. 2023

Chemical Engineering Journal

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Stand-off and up-close Raman detection of nitrates buried in sand and soils

Cited by 4 publications

References 14 publications

Short Distance Standoff Raman Detection of Extra Virgin Olive Oil Adulterated with Canola and Grapeseed Oils

Short Distance Standoff Raman Detection of Extra Virgin Olive Oil Adulterated with Canola and Grapeseed Oils

Homogeneous Metal Nitrate Hydroxide Nanoarrays Grown on Nickel Foam for Efficient Electrocatalytic Oxygen Evolution

Nitrate induced precise atom substitution and vacancies for overall water splitting

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