共查询到20条相似文献，搜索用时 328 毫秒
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采用原子荧光光度法检测砷时,不需接触紫外分光光度法测定砷时所需的三氯甲烷、三乙胺等有机溶剂,可以减少对检验人员的身体伤害。此方法操作简单易行,所需检测时间短,可以较大地提高检测效率。鱼粉样品经灰化后再经盐酸消解,断续流动进样,在硼氢化钾+酸体系中,采用氢化物发生—原子荧光光谱法测定鱼粉中砷含量。线性范围:0～200ng/mL;相关系数可达到0.9997;回收率可以达到76.2%～93.4%以上,批内变异系数≤3.9%,批间变异系数≤7.5%。该方法具有较高的准确度与灵敏度,能够满足鱼粉样品中砷含量的检测要求。 相似文献
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高效液相色谱法测定中兽药制剂中喹噁啉类药物 总被引：4，自引：2，他引：2
建立了中兽药制剂中喹乙醇、乙酰甲喹、卡巴氧、喹烯酮等药物含量测定的高效液相色谱法。样品经三氯甲烷∶甲醇(3∶1)提取后,苯基柱分离,在360 nm处检测。四种喹噁啉类药物在0.2~100μg/mL浓度范围内呈线性相关。在空白样品中添加50~150 mg/kg,回收率范围在87.90%~96.82%之间,批内变异系数为0.55%~4.65%。本方法的检测限为20 mg/kg,定量限为50 mg/kg。结果表明,本方法适合中兽药制剂中喹噁啉类药物的测定。 相似文献
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鱼粉中砷消解方法的优化 总被引：2，自引：0，他引：2
应用原子荧光法测定鱼粉中砷,分别运用干式灰化法、微波消解法和湿法消解3种前处理方法对样品进行消解并测定砷的含量。采用硝酸-高氯酸-硫酸体系进行湿法消解,检测鱼粉样品中的总砷,检测结果与中国合格评定国家认可委员会组织的鱼粉中重金属含量的测定(CNAS T0508)能力验证中位值相近(相对偏差=0.42%);相对标准偏差(n=6)0.39%;加标水平20 mg/kg,平均回收率98.02%～103.05%;检出限3.6μg/kg;线性范围80～450μg/mL,R2=0.998 2。结果表明:对于鱼粉这类难消解样品,采用硝酸-高氯酸-硫酸体系进行湿法消解,消解能力强,处理效果较好,检测灵敏度、准确度和精密度均能满足分析要求。 相似文献
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目的:研究应用AFS-8800型双道原子荧光光谱仪测定黄瓜中砷含量的方法。方法:以5%的盐酸为介质,2%硼氢化钾为还原剂,AFS-8800型双道原子荧光光谱仪测定。结果 :该法线性范围为0.0~10.0μg/L,相关系数r=0.9991,检出限为0.0174μg/ml,相对标准偏差为1.530%,回收率为92.9~100.4。结论:该方法精密度好,回收率高,操作简单,是测定黄瓜中砷含量的可靠方法。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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