A hand-saving HPLC method to measure urinary phenylmercapturic acid (PMA) was developed which allows about 35 PMA determinations per day. The method involves conversion of pre-PMA to PMA by the addition of sulfuric acid to a urine sample, extraction into an ether-methanol mixture followed by condensation under a nitrogen stream. The condensate was introduced to a ODS-3 column in a HPLC system, ...

Herein, we report for the first time synthesis of preformed bimetallic Pd-Rh nanoparticles with different Pd:Rh ratios (nominal molar ratio: 80–20, 60–40, 40–60, 20–80) and corresponding Pd Rh monometallic ones by sol immobilization using polyvinyl alcohol (PVA) as protecting agent NaBH4 reducing agent, carbon nanofibers high graphitization degree (HHT) desired support. The synthesized catalyst...

Lignin is the second most abundant polymer in nature, which also widely generated during biomass fractionation lignocellulose biorefineries. At present, of technical lignin simply burnt for energy supply although it represents richest natural source aromatics, and thus a promising feedstock generation value-added compounds. heterogeneous composition recalcitrant to degradation, with this substa...

OBJECTIVES Animal inhalation studies and theoretical models suggest that the pattern of formation of benzene metabolites changes as exposure to benzene increases. To determine if this occurs in humans, benzene metabolites in urine samples collected as part of a cross sectional study of occupationally exposed workers in Shanghai, China were measured. METHODS With organic vapour monitoring badg...

BACKGROUND For its toxicity, benzene exposure is one of the main health concerns for high risk occupations like gasoline station workers. However, there is little knowledge about the effect of benzene metabolites on hematological parameters. OBJECTIVE To evaluate the correlation between the urinary level of trans, trans-muconic acid (t, t-MA), a benzene metabolite, and some hematological para...

(31 %), m-nitrophenol (9%), p-nitrophenol (9%), m-aminophenol (4%), o-aminophenol (3 %), 4nitrocatechol (0.7 %), aniline (033%) and o-nitrophenol (0.1%). Two new metabolites, nitroquinol (0.1%) and p-nitrophenylmercapturic acid (0.3%), were found in the urine. 4. The denitration products, phenol, catechol, L-phenylmercapturic acid, and trans-tran8-muconic acid, did not occur in the urine. 5. Ni...