{"id":4481,"date":"2024-07-15T13:55:41","date_gmt":"2024-07-15T04:55:41","guid":{"rendered":"https:\/\/tuat-chemphys.net\/?p=4481"},"modified":"2024-07-15T13:55:41","modified_gmt":"2024-07-15T04:55:41","slug":"%e8%87%aa%e7%84%b6%e3%81%ae%e9%9a%a0%e3%82%8c%e3%81%9f%e3%80%8c%e6%b0%b4%e9%8a%80%e3%80%8d%e3%82%b5%e3%82%a4%e3%82%af%e3%83%ab%e3%82%92%e8%a7%a3%e6%98%8e-unveiling-natures-hidden-mercury-cycles","status":"publish","type":"post","link":"https:\/\/tuat-chemphys.net\/?p=4481","title":{"rendered":"\u81ea\u7136\u306e\u96a0\u308c\u305f\u300c\u6c34\u9280\u300d\u30b5\u30a4\u30af\u30eb\u3092\u89e3\u660e Unveiling Nature&#8217;s Hidden &#8220;Mercury&#8221; Cycles"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>&#8220;Unraveling Mercury&#8217;s Escape: How Oxygen and Soil Composition Influence Elemental Mercury Production in Riparian Environments&#8221; \u6c34\u8fba\u306e\u571f\u58cc\u304b\u3089\u306e\u6c34\u9280\u653e\u51fa\u306e\u8b0e\uff1a\u9178\u7d20\u3068\u571f\u58cc\u7d44\u6210\u304c\u5143\u7d20\u72b6\u6c34\u9280\u751f\u6210\u306b\u4e0e\u3048\u308b\u5f71\u97ff\u3092\u89e3\u660e<\/strong><\/h2>\n\n\n\n<p>\u5229\u8c37\u7814\u7a76\u5ba4\u3068\u5171\u540c\u7814\u7a76\u8005\u305f\u3061\u306f\u3001\u571f\u58cc\u4e2d\u306e\u9178\u7d20\u91cf\u304c\u3001\u6c5a\u67d3\u3055\u308c\u305f\u6cb3\u5ddd\u6577\u5730\u57df\u304b\u3089\u306e\u5143\u7d20\u72b6\u6c34\u9280\u306e\u653e\u51fa\u91cf\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3053\u3068\u3092\u767a\u898b\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u7814\u7a76\u3067\u306f\u3001\u7a7a\u6c17\u304c\u3042\u308b\u72b6\u614b\u3068\u306a\u3044\u72b6\u614b\u3068\u3044\u3046\u7570\u306a\u308b\u6761\u4ef6\u4e0b\u3067\u571f\u58cc\u30b5\u30f3\u30d7\u30eb\u3092\u8abf\u67fb\u3057\u3001\u6c34\u9280\u306e\u6319\u52d5\u3092\u7406\u89e3\u3057\u3088\u3046\u3068\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u7a7a\u6c17\u304c\u5b58\u5728\u3059\u308b\u6642\u306b\u3088\u308a\u591a\u304f\u306e\u6c34\u9280\u304c\u653e\u51fa\u3055\u308c\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u6709\u6a5f\u7269\u304c\u591a\u3044\u571f\u58cc\u3067\u306f\u7d50\u679c\u304c\u7570\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u306e\u7814\u7a76\u306f\u3001\u6cb3\u5ddd\u6577\u74b0\u5883\u306b\u304a\u3051\u308b\u6c34\u9280\u6c5a\u67d3\u306e\u7ba1\u7406\u65b9\u6cd5\u306e\u6539\u5584\u306b\u5f79\u7acb\u3061\u3001\u6c34\u9280\u306e\u653e\u51fa\u3092\u5236\u5fa1\u3059\u308b\u4e0a\u3067\u571f\u58cc\u7d44\u6210\u304c\u91cd\u8981\u3067\u3042\u308b\u3053\u3068\u3092\u5f37\u8abf\u3057\u3066\u3044\u307e\u3059\u3002Scientists from Riya Lab and their collaborators have discovered that the amount of oxygen in soil can significantly affect how much elemental mercury is released from contaminated riverside areas. This study examined soil samples under different conditions &#8211; with and without air &#8211; to understand how mercury behaves. They found that in most cases, more mercury was released when air was present. However, in soil with high organic matter, the results were different. This research helps us understand how to better manage mercury pollution in riverside environments and highlights the importance of soil composition in controlling mercury emissions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"810\" height=\"705\" data-attachment-id=\"4482\" data-permalink=\"https:\/\/tuat-chemphys.net\/?attachment_id=4482\" data-orig-file=\"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/07\/riya2024.webp?fit=968%2C842&amp;ssl=1\" data-orig-size=\"968,842\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"riya2024\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/07\/riya2024.webp?fit=810%2C705&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/07\/riya2024.webp?resize=810%2C705&#038;ssl=1\" alt=\"\" class=\"wp-image-4482\" srcset=\"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/07\/riya2024.webp?w=968&amp;ssl=1 968w, https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/07\/riya2024.webp?resize=300%2C261&amp;ssl=1 300w, https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/07\/riya2024.webp?resize=768%2C668&amp;ssl=1 768w\" sizes=\"auto, (max-width: 810px) 100vw, 810px\" \/><\/figure>\n\n\n\n<p>ORIGINAL ARTICLE:<\/p>\n\n\n\n<p><a href=\"https:\/\/doi.org\/10.1007\/s11356-024-33384-w\">https:\/\/doi.org\/10.1007\/s11356-024-33384-w<\/a><\/p>\n\n\n\n<p>Elemental mercury production from contaminated riparian soil suspensions under air and nitrogen bubbling conditions<\/p>\n\n\n\n<p>Shuting Zhao, Akihiko Terada, Makoto Nakashima, Takeshi Komai, Shohei Riya, Masaaki Hosomi &amp; Hong Hou<\/p>\n\n\n\n<p>The dynamic change of redox conditions is a key factor in emission of elemental mercury (Hg<sup>0<\/sup>) from riparian soils. The objective of this study was to elucidate the influences of redox conditions on Hg<sup>0<\/sup>\u00a0emission from riparian soils. Soil suspension experiments were conducted to measure Hg<sup>0<\/sup>\u00a0emission from five Hg-contaminated soil samples in two redox conditions (i.e., treated with air or with N<sub>2<\/sub>). In four of the five samples, Hg<sup>0<\/sup>\u00a0emission was higher in air treatment than on N<sub>2<\/sub>\u00a0treatment. Remaining one soil, which has higher organic matter than other soils, showed no distinct difference in Hg<sup>0<\/sup>\u00a0production between air and N<sub>2<\/sub>\u00a0treatment. In soil suspensions subject to N<sub>2<\/sub>\u00a0treatment, the dissolved organic carbon (DOC) and Fe<sup>2+<\/sup>\u00a0concentrations were 3.38- to 1.34-fold and 1.44- to 2.28-fold higher than those in air treatment, respectively. Positive correlations were also found between the DOC and Fe<sup>2+<\/sup>\u00a0(<em>r<\/em>\u2009=\u20090.911,\u00a0<em>p<\/em>\u2009&lt;\u20090.01) and Hg<sup>2+<\/sup>\u00a0(<em>r<\/em>\u2009=\u20090.815,\u00a0<em>p<\/em>\u2009&lt;\u20090.01) concentrations in soil solutions, suggesting Fe<sup>2+<\/sup>\u00a0formation led to the release of DOC, which bound to Hg<sup>2+<\/sup>\u00a0in the soil and, in turn, limited the availability of Hg<sup>2+<\/sup>\u00a0for reduction to Hg<sup>0<\/sup>\u00a0in N<sub>2<\/sub>\u00a0treatment. On the other hand, for remaining one soil, more Hg<sup>2+<\/sup>\u00a0might be adsorbed onto the DOM in the air treatment, resulted in the inhibition of Hg<sup>0<\/sup>\u00a0production in air treatment. These results imply that the organic matter is important to prevent Hg<sup>0<\/sup>\u00a0production by changing redox condition. Further study is needed to prove the role of organic matter in the production of Hg<sup>0<\/sup>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6cb3\u5ddd\u6577\u74b0\u5883\u306b\u304a\u3051\u308b\u6c34\u9280\u6c5a\u67d3\u306e\u7ba1\u7406\u65b9\u6cd5\u306e\u6539\u5584\u306b\u5f79\u7acb\u3061\u3001\u6c34\u9280\u306e\u653e\u51fa\u3092\u5236\u5fa1\u3059\u308b\u4e0a\u3067\u571f\u58cc\u7d44\u6210\u304c\u91cd\u8981\u3067\u3042\u308b How to better manage mercury pollution in riverside environments and highlights the importance of soil composition in controlling mercury emissions.<\/p>\n","protected":false},"author":1,"featured_media":4482,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[9],"tags":[15],"class_list":["post-4481","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","tag-environmental-technology"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/07\/riya2024.webp?fit=968%2C842&ssl=1","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":6478,"url":"https:\/\/tuat-chemphys.net\/?p=6478","url_meta":{"origin":4481,"position":0},"title":"Eco-friendly 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\u5c71\u5730\u57df\u306b\u304a\u3051\u308b\u6c34\u9280\u304a\u3088\u3073\u30a2\u30f3\u30c1\u30e2\u30f3\u306e\u5206\u5e03\u3001\u6392\u51fa\u3068\u5909\u63db","rel":"","context":"In &quot;Doctoral Thesis \u535a\u58eb\u8ad6\u6587&quot;","block_context":{"text":"Doctoral Thesis \u535a\u58eb\u8ad6\u6587","link":"https:\/\/tuat-chemphys.net\/?cat=22"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/05\/image-1.png?fit=774%2C467&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/05\/image-1.png?fit=774%2C467&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/05\/image-1.png?fit=774%2C467&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2024\/05\/image-1.png?fit=774%2C467&ssl=1&resize=700%2C400 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Intro \u7814\u7a76\u5ba4\u7d39\u4ecb&quot;","block_context":{"text":"Lab. Intro \u7814\u7a76\u5ba4\u7d39\u4ecb","link":"https:\/\/tuat-chemphys.net\/?cat=6"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2026\/02\/image-7.png?fit=416%2C341&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":7493,"url":"https:\/\/tuat-chemphys.net\/?p=7493","url_meta":{"origin":4481,"position":3},"title":"\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u3092\u542b\u3080\u9ad8\u5206\u5b50\u6eb6\u6db2\u306f\u3001\u4e7e\u71e5\u4e2d\u306b\u3069\u3046\u5909\u5316\u3059\u308b\u306e\u304b\uff1fUnderstanding Drying-Rate Changes in Polymer Solutions with Colloidal Particles","author":"unet","date":"2026-02","format":false,"excerpt":"\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u5165\u308a\u9ad8\u5206\u5b50\u6eb6\u6db2\u306f\u3001\u306a\u305c\u4e7e\u71e5\u304c\u65e9\u304f\u9045\u304f\u306a\u308b\uff1f \u305d\u306e\u201c\u81e8\u754c\u91cf\u201d\u3068\u666e\u904d\u7684\u3075\u308b\u307e\u3044\u3092\u89e3\u660e\uff01Why do polymer solutions with colloids dry differently? This study reveals the \u201ccritical threshold\u201d and universal behavior.","rel":"","context":"In &quot;Research Topics&quot;","block_context":{"text":"Research Topics","link":"https:\/\/tuat-chemphys.net\/?cat=9"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2026\/02\/image-8.png?fit=500%2C268&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":6830,"url":"https:\/\/tuat-chemphys.net\/?p=6830","url_meta":{"origin":4481,"position":4},"title":"Alumni \u6d3b\u8e8d\u3059\u308b\u5352\u696d\u751f","author":"unet","date":"2022-12","format":false,"excerpt":"\u6771\u5317\u5927\u5b66\u591a\u5143\u7269\u8cea\u79d1\u5b66\u7814\u7a76\u6240\u30fb\u52a9\u6559\u3001JST\u5275\u767a\u7814\u7a76\u8005\u3002Assistant Professor at Tohoku University. 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