Atmospheric peroxides, especially hydrogen peroxide (H2O2), are essential oxidants. The concentration is closely related to the extent of OH radicals and O3 cycle in tropospheric atmospheric chemistry. However, only a few studies have investigated their concentrations China because inadequacies measurement techniques or higher costs analytical instruments. Therefore, it design suitable analysis...

Atmospheric pollutants can corrode heritage materials, especially stone, which cause a great loss that goes far beyond the economic losses of degraded materials. Over past decades, conventional air have been slashed owing to clean actions in China, produces significant co-benefit for conservation. However, benefits may be offset by increases photochemical oxidants smog, such as ozone, damage Th...

The direct reaction kinetic method of low pressure fast discharge flow (DF) with resonance fluorescence monitoring of OH (RF) has been applied to determine rate coefficients for the overall reactions OH + C2H5F (EtF) (1) and OH + CH3C(O)F (AcF) (2). Acetyl fluoride reacts slowly with the hydroxyl radical, the rate coefficient at laboratory temperature is k2(300 K) = (0.74 ± 0.05) × 10(-14) cm(3...

Introduction Blue light is a part of the spectrum with the highest energy content, which can reach the retina. The damage that it can cause to the retina is called photochemical or blue-light retinal injury. For the retinal injury assessment of the photochemical and aphakic retinal hazards in the wavelength range of 300-700 nm, use of effective spectral radiance limits (W.m-2.sr-1) seems to be...

Oxidative stress is known to cause cataracts in lens culture systems and is believed to be an important factor contributing to human cataracts. In this communication, it is demonstrated that cataract development of cultured rat lenses produced as a result of photochemically induced oxidation in a 4% oxygen atmosphere similar to the native environment of the lens can be blocked by the transition...

Anthocyanins are naturally occurring compounds, member of the flavonoid groups of photochemical, involved in defense against the damaging effects of UV irradiation in plants and protect from many oxidants. The anthocyanins, group of pigments are relatively small and diverse flavonoid family in nature, and responsible for the attractive colors, red and purple to blue in many plants. Presence of ...

Credible climate change predictions require reliable fundamental scientific knowledge of the underlying processes. Despite extensive observational data accumulated to date, atmospheric aerosols still pose key uncertainties in the understanding of Earth's radiative balance due to direct interaction with radiation and because they modify clouds' properties. Specifically, major gaps exist in the u...

This paper is presented to make both ocular symptoms and signs clear, by means of some experiments on the eye affected by photochemical air pollution. This paper summarizes three experiments, these results and discussion. The first series of experiments were performed in order to research eye irritation caused by photochemical synthetic irritants. They proved the threshold of eye irritation and...

The complexation of iron(III) with oxalic acid in aqueous solution yields a strongly absorbing chromophore that undergoes efficient photodissociation to give iron(II) and the carbon dioxide anion radical. Importantly, iron(III) oxalate complexes absorb near-UV radiation (λ > 350 nm), providing a potentially powerful source of oxidants in aqueous tropospheric chemistry. Although this photochemic...

Fine-particle pollution associated with winter haze threatens the health of more than 400 million people in the North China Plain. Sulfate is a major component of fine haze particles. Record sulfate concentrations of up to ~300 μg m-3 were observed during the January 2013 winter haze event in Beijing. State-of-the-art air quality models that rely on sulfate production mechanisms requiring photo...