[Rapid detection of residual cyclohexanone in disposable medical devices by ultraviolet photoionization ion mobility spectrometry (UV-IMS)].

In the manufacture of disposable PVC medical devices, cyclohexanone is frequently used as an adhesive reagent, which can be released into the tube airspace or stored solution and thus may cause some adverse effects on patients in therapy. In this paper, an ultraviolet photoionization ion mobility spectrometry (UV-IMS) technique has been developed to detect cyclohexanone through monitoring the gas composition within a package of infusion sets. The concentrations of cyclohexanone were prepared by means of exponential dilution method, and the experiments show that the UV-IMS has a limit of detection at 15 ppb and its measurable linear dynamics range is over three orders of magnitude.

[Photoionization ion mobility spectrometry (UV-IMS) for the isomeric volatile organic compounds].

The construction and performance study is reported for a newly developed ultraviolet photoionization ion mobility spectrometry (UV-IMS). In the present paper, an UV-IMS technique was firstly developed to detect eleven isomeric volatile organic compounds including the differences in the structure of carbon chain, the style of function group and the position of function group. Their reduced mobility values were determined and increased in this order: linears < branches < cycles, primary < secondary < tertiary, para- < meta- < ortho- and alcohols < acetones < aromas.

[Survey on prevalence of 1 526 children with sleep disturbances in age of 2 to 12 years old in Chengdu].

Objective: To find out the prevalence of sleep disturbances for children aged 2 to 12 years old in Chengdu.

Methods: Totally 1 600 children aged 2-12 years old were selected from 5 districts in Chengdu and investigated by using questionnaire.

Results: All 1 526 survey papers were returned.