Objective To establish a simple,accurate and sensitive method for determination of cyanide in drinking water. Methods By means of using flow injection analysis instrument, the cyanide in drinking water was determined on-line. Results The data obtained by this assay accorded with Beer's Law, the range was 2.0-50.0 ?g/L, r≥0.999, the detection limit, relative standard deviation and recovery rate were 0.23 ?g/L, 2.5%-3.8% and 94.9%-98.7% respectively. The sampling frequency was 20 samples per hour. Conclusion The method for determination of cyanide in drinking water employed in the present paper is simple, accurate, sensitive and suitable for the analysis of large number of water samples.

Objective To assess the reliability and validity of the Pittsburgh sleep quality index (PSQI) .Methods The cross-sectional survey was conducted in the outpatient department of this hospital .544 insomnia and non-insomnia voluntary participants (18-65 years old) from July to October 2011 were assessed with PSQI and the insomnia severity index (ISI) ,which were randomly delivered to them .Results The test-retest reliability of PSQI was 0 .994 .The split-half reliability coefficient of PSQI was 0 .824 . The overall Cronbach′s alpha coefficient was 0 .845 .The confirmatory factor analysis showed that the fitting indicators for the χ2/df ,root mean square error of approximation(RMSEA) ,non-normed fit index(NNFI) ,comparative fit index(CFI) and goodness-of-fit index(GFI) were 4 .83 ,0 .09 ,0 .96 ,0 .98 and 0 .97 respectively .The correlation coefficient between the PSQI and ISI was 0 .842 . The correlations coefficients between PSQI with the questionnaire type ,interview date and interview department were -0 .046 , 0 .276 and -0 .331 .Grouping by individuals with or without insomnia ,the area under the receiver operator characteristic curve (ROC) for PSQI was 0 .944(95% CI:0 .925-0 .963) .Conclusion PSQI has good reliability and validity ,and could be used for the sleep quality comprehensive evaluation in the patients with insomnia .