A suite of 16 crude oil samples from 13 oilfields in the Qaidam Basin were analyzed using techniques including gas chromatography and gas chromatography ‐ mass spectrometry. Biomarker compositions and parameters were used to investigate the palaeoenvironmental and depositional conditions and to correlate the oils with eachother. Oils from the western Qaidam Basin have pristane/phytane (Pr/Ph) ratios of less than 0.7, and contain abundant gammacerane, C27 steranes, 4‐methyl steranes and long‐chain tricyclic terpanes. C29 sterane 20S/(20S+20R) and ββ/(ββ+αα) ratios show that the western Qaidam oils have variable maturities ranging from immature to mature. Oils from the northern Qaidam Basin, by contrast, have Pr/Ph ratios greater than 3, low gammacerane contents, and relatively abundant C29 steranes, bicyclic terpanes and alkylcyclohexanes. C29 sterane 20S/(20S+20R) and ββ/(ββ+αα) ratios indicate that the northern Qaidam oils are mature. δ13C values, which range from ‐25.4‰ to ‐28.3‰ with the exception of one oil from the north (‐3l.6‰), are similar for oils from both the northern and western parts of the Qaidam Basin. The oils'carbon isotope compositions are similar to those of the organic matter in potential source rocks. The western Qaidam oils are inferred to have originated from Tertiary source rocks deposited under anoxic and saline‐hypersaline lacustrine conditions with dominant algal organic matter. The northern Qaidam oils are interpreted to be derived from Jurassic source rocks which were deposited in a freshwater lacustrine environment and which are dominated by terrigenous organic matter.

Like BPA, bisphenol F (BPF) was used in the production of epoxy resins and polycarbonates and it was shown to be a xenoestrogen. The photodegradation of bisphenol F (BPF) in the presence of algae was investigated under the irradiation of metal halide lamps placed in cooling trap for maintaining constant temperature by water circulation (λ≥365 nm, 250 W). The effect of algae concentration, initial pH value, concentration of humic acid and ferric ions, gas medium were investigated. The results showed that algae can enhance the photodegradation of BPF. The photodegradation rate of BPF increased with increasing algae concentration. Humic acid and Fe 3+ ions also enhanced the photodegradation of BPF. The effect of pH value on the BPF photodegradation was important in the present of algae, humic acid and ferric ions. This work helps environmental scientists to understand the photochemical behavior of BPF in simulated lake water.