Objective To enhance the level and ability of measuring pesticide residues in raw milk and find out the primary factors of affecting measurement uncertainty.Methods The mathematic model of measurement was established in order to evaluate measurement uncertainty of organophosphorus pesticide residues in raw milk with gas chromatography.Results The standard measurement uncertainty of organophosphorus pesticide residues in raw milk made up of weighing,sampling and diluting procedures,standard matter,sample volume,instrument calibration.The calculating formula of expanded measurement uncertainty was U=k?CX?urel(tptal).The expression of measurement result was C=CX?U.Volume of 6 kinds of organophosphorus pesticides residues were 0.4?0.050,0.4?0.029,0.4?0.027,0.4?0.029,0.4?0.057,0.4?0.034(mg/kg) respectively in raw milk which the standard matter of pesticide was added in.Conclusion From the evaluation of measurement uncertainty of pesticide residues in raw milk with gas chromatography,we can see that the measurement uncertainty is composed of many factors,which commonly comes from random variable and fuzzification,and can be assessed by statistic distribution and standard deviation.

Objective To investigate the epidemic factors of human brucellosis in Qiqihar from 2008 to 2014 so as to provide a scientific basis for prevention and control of the disease.Methods Descriptive epidemiologic method was used to analyze the monitoring results of human brucellosis in Qiqihar between 2008 and 2014.Indexes observed were:the incidence rate,the distribution of gender,age,occupation,area and time.Results From 2008 to 2014,there were a total of 15 003 cases of brucellosis covering all counties.The average incidence rate was 38.85/100 000.The average incidence rate of Meilisi Daur District was the highest,178.93/100 000.Cases occurred year around and peaked in March-July.The average incidence rate of male and female brucellosis was 57.53/100 000 and 19.35/100 000,respectively,and male patients were more than female (x2 =3 658.973,P ＜ 0.05).Most patients were in the 41-50 years old age group,and the number of patients was 4 386.The major occupation was farmer (herdsmen),which acount for 93.96％ (14 097/15 003).Conclusions Qiqihar is the epidemic area of brucellosis and has a higher incidence.Governments should pay nore attention to the epidemic of brucellosis.Health education and intervention measure for high-risk population should be strengthened and the professional team should be reinforced so as to reduce the incidence of brucellosis.

Objective To investigate the knowledge awareness on hepatitis B prevention among voluntary blood donor in Qiqihar, and analyze its influencing factors to provide a evidence for implementation of effective health education. Methods A total of 1 026 voluntary blood donors were investigated by self-design questionnaire in Blood Donor Room in Qiqihar in June 2014, and the data was analyzed by SPSS 13. 0. Results The knowledge awareness of 1 026 donors was 55. 9%, in which the illiterate had the lowest rate of knowledge awareness (24. 0%), and junior college and beyond educational background having highest rate (73. 3%). There were no statistical differences of hepatitis B prevention knowledge awareness between different age groups (P>0. 05);but donors with different culture had statistical differences on the hepatitis B prevention knowledge awareness, and the method and expected method to acquire the knowledge (P<0. 01); the donors with different culture also had different attitudes towards the HBV infect-or (χ2 =94. 17,P<0. 01). Conclusions The voluntary blood donors have low awareness of hepatitis B prevention knowledge in Qiqihar, have the fear and discrimination for HBV infect-or, so we should provide different health education method according to different group characteristics.