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Marine sediments from coastal Florida, USA impacted by Karenia brevis blooms were resuspended in seawater and irradiated in a solar simulator to determine if sedimentary bound PbTx-2 is photolytically released into the aqueous phase. All bulk and size-fractionated (<10–20μm) sediments exhibited photorelease of PbTx-2 after a six-hour full spectrum irradiation. The magnitude of photorelease of a...
Snow chamber and snow-pile experiments performed during the 'Alert 2000' campaign show significant release of NO, NO 2 , and HONO in steady ratios under the influence of irradiation. Both light and a minimal degree of heating are required to produce this effect. We suggest diffusion and re-distribution of NO 3- in the form of HNO 3 as an important step in the mechanism...
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