Sonochemical dosimetry: A comparative study of Weissler, Fricke and terephthalic acid methods.
Sonochemical dosimetry: A comparative study of Weissler, Fricke and terephthalic acid methods.
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DOI：
10.1016/j.ultsonch.2020.105413
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发表时间：
2021-04
影响因子：
8.4
通讯作者：
Ashokkumar M
中科院分区：
文献类型：
--
作者：
Rajamma DB;Anandan S;Yusof NSM;Pollet BG;Ashokkumar M
报道了Weissler、Fricke和对苯二甲酸剂量法的有效性。Weissler和Fricke剂量法提供了相当的OH自由基产率。对苯二甲酸剂量测定提供了非常低的OH自由基产率。讨论了可能的原因和建议。这篇论文可能会引发声化学研究人员之间的进一步讨论。声空化和声化学反应在超声的各种应用中起着重要的作用。许多剂量学方法在实践中量化由声空化产生的自由基的数量。在本研究中，比较了Weissler， Fricke和对苯二甲酸剂量法测量的羟基自由基（OH•）产量，并使用490 kHz高频声化学反应器评估了这些方法的有效性。在490 kHz下，Weissler和Fricke剂量下，超声5 min得到的OH•产率分别为200µM和289µM。而在类似的实验条件下使用对苯二甲酸剂量法时，发现OH•产率非常低（8µM）。虽然结果与Iida等人的报告一致。J., 80(2005) 159)，本研究进一步讨论了机理细节和干扰反应。例如，用Weissler和Fricke方法测定的OH•的量可能有一些不确定性，因为HO2•是在氧气存在的情况下形成的。为了解释与对苯二甲酸剂量法观察到的主要差异，进行了高效液相色谱（HPLC）分析，其中观察到2-羟基对苯二甲酸以外的另外两种产品。电喷雾电离质谱（ESI-MS）分析表明，该反应的副产物之一为2,5-二羟基对苯二甲酸，并伴有其他未确定的副产物。尽管形成了消耗OH•的附加产物，但这种剂量法获得的OH•产率非常低的原因无法证明，质疑该方法的适用性，该方法不仅用于量化声空化产生的OH•产率，还用于量化其他过程（如γ-辐射溶解）产生的OH•产率。作者希望这篇意见论文可以引发声化学领域研究人员的进一步讨论，以帮助解决使用这些剂量测定方法的不确定性。
The validity of Weissler, Fricke and terephthalic acid dosimetry methods is reported. Weissler and Fricke dosimetries provided comparable OH radical yields. Terephthalic acid dosimetry provided very low OH radical yield. Possible reasons and recommendations are discussed. Opinion Paper may initiate further discussion among researchers working in sonochemistry. Acoustic cavitation and sonochemical reactions play a significant role in various applications of ultrasound. A number of dosimetry methods are in practice to quantify the amount of radicals generated by acoustic cavitation. In this study, hydroxyl radical (OH•) yields measured by Weissler, Fricke and terephthalic acid dosimetry methods have been compared to evaluate the validities of these methods using a 490 kHz high frequency sonochemical reactor. The OH• yields obtained after 5 min sonication at 490 kHz from Weissler and Fricke dosimetries were 200 µM and 289 µM, respectively. Whereas, the OH• yield was found to be very low (8 µM) when terephthalic acid dosimetry was used under similar experimental conditions. While the results agree with those reported by Iida et al. (Microchem. J., 80 (2005) 159), further mechanistic details and interfering reactions have been discussed in this study. For example, the amount of OH• determined by the Weissler and Fricke methods may have some uncertainty due to the formation of HO2• in the presence of oxygen. In order to account for the major discrepancy observed with the terephthalic acid dosimetry method, high performance liquid chromatography (HPLC) analysis was performed, where two additional products other than 2-hydroxy terephthalic acid were observed. Electrospray ionization mass spectrometry (ESI-MS) analysis showed the formation of 2,5-dihydroxyterephthalic acid as one of the by-products along with other unidentified by-products. Despite the formation of additional products consuming OH•, the reason for a very low OH• yield obtained by this dosimetry could not be justified, questioning the applicability of this method, which has been used to quantify OH• yields generated not only by acoustic cavitation, but also by other processes such as γ-radiolysis. The authors are hoping that this Opinion Paper may initiate further discussion among researchers working in sonochemistry area that could help resolve the uncertainties around using these dosimetry methods.
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影响因子：
3.4
作者：
DOOLEY, DA;SACKS, PG;MILLER, MW
通讯作者：
MILLER, MW
DOI：
10.1007/978-1-4419-7472-3_1
发表时间：
2011-01-01
期刊：
ULTRASOUND TECHNOLOGIES FOR FOOD AND BIOPROCESSING
影响因子：
--
作者：
Kentish, Sandra;Ashokkumar, Muthupandian
通讯作者：
Ashokkumar, Muthupandian
影响因子：
56.9
作者：
DOKTYCZ, SJ;SUSLICK, KS
通讯作者：
SUSLICK, KS
影响因子：
8.4
作者：
BERLAN, J;TRABELSI, F;PETRIGNANI, JF
通讯作者：
PETRIGNANI, JF
影响因子：
8.4
作者：
Kobayashi, Daisuke;Honma, Chiemi;Shono, Atsushi
通讯作者：
Shono, Atsushi