The detection of content of potassium bromate in wheat flour titrated by hyposulphite is introduced,basing on the principle of separation out of iodine when potassium bromate meets potassium iodide in acid liquid. It is proved that the least limits is 0.01 g/kg,the rate of recovery is from 83%-107% and the variation coefficient is within 5%.
[Methods]Potassium iodide in phosphoric solution was oxidated by the acid radical of iodic acid,iodine was generated; the reaction of iodine and excessive potassium iodide generated I-3,type 723 spectrometer was applied for the determination with a wave length of 351 nm.
A sample throughput of 70 samples per hour was obtained and the detection limit(3σ) was 1.3×10~-8 mol/L. The relative standard deviation for eleven repeated measurements for 2.0×10~-6 mol/L iodide was 2.6%. The method was successfully applied to the determination of iodine in food and the recoveries was 92.8%～107.7%.
Characterization of iodine species in the marine aerosol: To understand their roles in particle formation processes
In this contribution, iodine chemistry in the Marine Boundary Layer (MBL) is introduced.
A series of methodologies for the measurements of iodine species in the gas and particle phases of the coastal atmosphere has been developed.
Iodine species in the gas phase in real air samples has been determined in two field campaigns at the west coast of Ireland, indicating that gaseous iodo-hydrocarbons and elemental iodine are the precursors of new particle formation.
Particulate iodine speciation from the same measurement campaigns show that the non-water-soluble iodine compounds are the main iodine species during the marine particle formation.
Mercury iodide and nitrate contribute more to inhibiting cathepsin B and calpains activities in the above tissues, respectively.
The reduction of copper iodide occurs through the solution with the formation of Cu nanoparticles, the sizes of which are comparable to those of the initial iodide particles, and is limited only by the CuI dissolution rate.
Computer Simulation of the Initial Stage of Water Vapor Nucleation on a Silver Iodide Crystal Surface: 1.
The nucleation of water vapors on the surface of a fragment of silver iodide crystal is simulated by the Monte Carlo method under the conditions similar to natural conditions in a humid atmosphere.
Computer Simulation of the Initial Stage of the Nucleation of Water Vapors on the Silver Iodide Crystal Surface: 2.