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The effective determination of heavy metals from environmental media is among the most important issues for many industrialized countries. The interaction between RS-N, as novel heavy metal probe, and metal ions was studied. RS-N shows selective color change from colorless to pink in the presence of Hg²⁺ in methanol/water solvent and the UV–Vis study shows peak at 560 nm. Fluorescence data revealed that the fluorescence enhance of RS-N by Hg²⁺ dramatically was the result of the formation of [Hg²⁺]RS-N complex. The effective association constants (K ₐ ) were 3.97 × 10⁵ and 0.204 × 10⁵ M⁻¹ for Hg²⁺ and Cu²⁺ to RS-N, respectively. The thermodynamic parameters, enthalpy change (ΔH ⁰) and entropy change (ΔS ⁰), were calculated to be −6.431 ± 0.226 kJ/mol and −0.129 ± 0.008 J/K/mol, respectively, according to van’t Hoff equation on the basis of Gibbs free energy (ΔG ⁰) ranged from −33.8326 to −28.5389 kJ/mol.

Episode 129 – Messenger: Mercury is the closest planet to the Sun, which makes it both difficult to observe and to visit with a probe. To minimise this problem Messenger is on a circuitous path using the gravitation from both Venus and Earth to help it approach Mercury at an oblique angle to the Sun.

Birmingham, U.K.—The European Space Agency 's (ESA's) science program is preparing to approve a billion-dollar mission to Mercury. Likely to fly late in the next decade, the mission would be humanity's first close-up look at Mercury since Mariner 10, some 20 years ago. One focus of the mission will be Mercury's unexpectedly strong and complex magnetic field. ESA scientists hope to explore the envelope of charged particles trapped by the field and learn what kind of metal core could be generating it. Birmingham, U.K.—Drawing on three spacecraft—U.S., Japanese, and Russian—that are now flying through Earth's magnetosphere, scientists are planning a 3- to 5-month campaign of coordinated observations. By making simultaneous measurements at different points in this vast region of trapped particles, they hope to unravel how it captures energy from the solar wind and funnels it toward Earth. The campaign is scheduled for this winter, when the orbits of all three satellites will place them in favorable positions.