Stability of Solid Uranyl Peroxides under Irradiation.

The effects of radiation on a variety of uranyl peroxide compounds were examined using γ-rays and 5 MeV He ions, the latter to simulate α-particles. The studied materials were studtite, [(UO)(O)(HO)](HO), the salt of the U uranyl peroxide cage cluster, LiK[(UO)(O)(OH)]·255HO, the salt of UOx uranyl peroxide oxalate cage cluster, LiK[{(UO)(O)}(CO)]·HO, and the salt of the UPp (Pp = pyrophosphate) uranyl peroxide pyrophosphate cage cluster, LiNa[(UO)(O)(PO)]·120HO. Irradiated powders were characterized using powder X-ray diffraction, Raman spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, and UV-vis spectroscopy.

Green design of a paper test card for urinary iodine analysis.

When young children do not receive adequate amounts of the micronutrient iodine in their diet, their growth and cognitive development can be impaired. Nearly every country in the world has programs in place to track iodine intake and provide supplemental iodine if needed, usually in the form of fortified salt. The iodine nutrition status of a population can be tracked by monitoring iodine levels in urine samples to see if the median value falls in the range of 100-300 micrograms of iodine per liter of urine (μg I/L), which indicates adequate or more than adequate iodine nutrition.

saltPAD: A New Analytical Tool for Monitoring Salt Iodization in Low Resource Settings.

We created a paper test card that measures a common iodizing agent, iodate, in salt. To test the analytical metrics, usability, and robustness of the paper test card when it is used in low resource settings, the South African Medical Research Council and GroundWork performed independent validation studies of the device. The accuracy and precision metrics from both studies were comparable.

Lab on paper: iodometric titration on a printed card.

A paper test card has been engineered to perform an iodometric titration, an application that requires storage and mixing on demand of several mutually incompatible reagents. The titration is activated when a user applies a test solution to the test card: the dried reagents are reconstituted and combined through a surface-tension-enabled mixing (STEM) mechanism. The device quantifies 0.