共查询到19条相似文献，搜索用时 203 毫秒
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目的 了解南方三省杨梅农药残留和甜蜜素添加状况,维护杨梅鲜果质量安全,应对舆论关切,促进产业良性发展。方法 通过线上和线下购买杨梅主要产区浙江、福建、云南的市售新鲜杨梅作为检测样本,采用气相色谱法对杨梅中甜蜜素进行检测分析,采用气相色谱-质谱联用法对杨梅中43项农药残留进行检测分析。对检出农药作急性膳食摄入风险评估和慢性膳食摄入风险评估,并采用相对强度系数法 (RPF)对检出率较高的拟除虫菊酯类农药进行累积急性膳食评估。结果 213批次杨梅中,甜蜜素均未检出,171批次样品检出农药残留,样品农药残留检出率为80.3%,其中66.7%样品检出两项及以上农药。检测的43项农药中,9项农药有检出,其急性膳食摄入风险评估最高值为60%,慢性膳食摄入风险评估最高值为0.024%;拟除虫菊酯类农药累积急性膳食评估值为93%。结论 未发现南方三省杨梅违规添加甜蜜素。对成年人而言,农药残留的各项膳食摄入风险评估值均＜100%,在安全范围内,风险可接受。 相似文献
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《蚕桑茶叶通讯》2008,(6)
本发明涉及拟除虫菊酯类农药残留降解菌改良农作物品质的应用，属于微生物肥料领域。以拟除虫菊酯类农药残留降解菌菌株LFJS3—9作为菌种生产的菌剂，按照30～75kg／hm^2的用量，稀释15～20倍后，选择天气晴朗的下午，均匀喷洒在作物植株表面或土壤中。一般在作物最后一次使用农药后使用，多次使田或在作物生长旺盛期使用效果更佳。经过研究测定，拟除虫菊酯类农药残留降解菌菌剂中含有多种营养成分，使用本发明方法，具有生产使用成本低，使用方便，农作物品质改良显著的优点，适用于现代农业生产中优质农产品的生产与加工，适合在茶叶、蔬菜等经济作物和水稻等粮食作物上大面积推广使用。 相似文献
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<正> 拟除虫菊酯类农药是近20年来人工合成的系列类似天然除虫菊素化学结构的合成除虫菊酯。不仅保持了天然除虫菊素杀虫高效强击倒、低毒、低残留的特点,而且在杀虫毒力及对日光的稳定性上都优于天然除虫菊。 相似文献
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固相萃取-气相色谱法测定饲料中13种有机氯农药残留量 总被引：1，自引：0，他引：1
建立了饲料中13种有机氯类农药残留的固相萃取-毛细管气相色谱(SPE-CGC)分析方法。以丙酮-正己烷混合物作提取剂,采用超声波提取样品,然后用固相萃取柱净化提取物。采用OV-1701毛细管气相色谱柱分离样品,电子捕获检测器(ECD)。有机氯农药的平均回收率:83.76%～106.22%,RSD为1.46%～5.72%,检出限:0.00039～0.00352μg/ml。结论:该法简便快速、灵敏准确,可广泛应用于饲料中有机氯农药的检测。 相似文献
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牛奶中磺胺类抗生素的快速检测分析 总被引：1，自引：0，他引：1
建立牛奶中磺胺类抗生素残留检测的放射免疫方法。通过对磺胺嘧啶、磺胺甲基嘧啶、磺胺二甲基嘧啶、磺胺甲氧哒嗪、磺胺甲基异恶唑、磺胺间甲氧嘧啶、磺胺间二甲氧嘧啶和磺胺喹恶啉8种磺胺类药物在空白牛奶样品中的加标试验,确定该方法的筛选水平。结果发现,采用放射免疫法检测牛奶中的磺胺类抗生素,筛选水平可达到10μg/L,变异系数在1.79%￣5.56%之间;对8种磺胺类药物的混合标准溶液进行检测,100%可以被检测出,检测限达5μg/L。放射免疫法检测牛奶样品中的磺胺类抗生素,方法简便、快速,灵敏度和精确度能够达到检测要求。 相似文献
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建立顶空气相色谱法测定蔗糖脂肪酸酯中的甲醇、异丙醇、甲基乙基酮、乙酸乙酯和异丁醇5种残留溶剂。称取样品直接顶空进样,建立以DB-1毛细管柱（60 m×530μm,1μm）为分析柱、平衡温度80℃、平衡时间40 min的残留溶剂测定方法。结果表明：5种残留溶剂在0.05～10.00μg范围内线性关系良好,相关系数均大于0.999;甲醇、异丙醇、甲基乙基酮、乙酸乙酯和异丁醇的方法定量限依次为0.024 4、0.019 7、0.022 7、0.024 5、0.019 2 mg/kg,平均回收率为81.7%～96.8%,相对标准偏差为1.90%～4.52%;方法前处理操作简单快速、回收率和精密度良好,适用于蔗糖脂肪酸酯中5种残留溶剂检测;20批次蔗糖脂肪酸酯样品检测结果显示,17批次样品中检出的3种溶剂残留量均符合世界卫生组织食品添加剂联合专家委员会的要求,甲醇的检出率最高达到80%,亲油型样品中残留溶剂检出种类主要为甲醇,其残留量最高达到9.42 mg/kg,亲水型样品中残留溶剂检出种类较亲油型多,但含量相对较低。 相似文献
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牛奶中有机磷农药残留的气相色谱法测定 总被引：1，自引：0，他引：1
提出同时测定牛奶中敌百虫、甲胺磷、敌敌畏、马拉硫磷、倍硫磷五种有机磷农药残留的检测方法。在选定的色谱条件下,添加浓度在0.5～10.0μg/mL之间时5种农药的检测限分别为0.031μg/mL、0.013μg/mL、0.023μg/mL、0.019μg/mL和0.014μg/mL,回收率范围分别达81.0%～85.5%、84.5%～89.4%、79.0%～81.8%、77.3%～82.5%和77.9%～89.5%,变异系数在0.29%～3.96%之间。本方法对牛奶中有机磷农药残留的检测分析准确可靠。 相似文献
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作者采用凝胶渗透色谱（GPC）对奶油中8种有机氯农药进行样品前处理,气相色谱—电子捕获检测器进行测定,以保留时间定性,峰面积定量。在10~800 ng/mL浓度范围内,8种有机氯农药的线性良好,相关系数在0.9981~0.9996,回收率在92.4%～117.0%,RSD在1.83%～7.92%,方法检出限为0.65~2.33 μg/kg,满足奶油中有机氯农药残留检测要求。 相似文献
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植物性杀虫剂,即源自植物,是植物的某一部分(如花、叶、茎、根)或其提取物所组成的各种配方。植物精油往往被用作昆虫引诱剂或驱避剂。植物性杀虫剂,尤其是天然除虫菊酯类对动物和植物的各种害虫具有很好的毒杀作用,而且在环境中残留时间很短,对动物的毒性很低。拟除虫菊酯为人工合成的类似除虫菊样化合物,具有卓越的杀虫活性和击倒能力。现介绍三种植物性杀虫剂:鱼藤酮、除虫菊酯和拟除虫菊酯。 相似文献
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[目的]开发同时检测生乳中吡虫啉（Imidacloprid）、吡唑醚菌酯（Pyrazole ether ester）、氟虫腈（Fluorine worm nitrile）3 种农药残留的胶体金免疫层析的方法。[方法]采用柠檬酸三钠还原法制备胶体金溶液，冻干法制备胶体金标抗体冻干粉，置于微孔杯内，复溶后，吸取全部反应液于胶体金试纸条样品垫上，经层析，在免疫层析试纸条上显示结果。[结果]吡虫啉、吡唑醚菌酯、氟虫腈3 种农药检测检测下限分别为0.1 mg/kg，0.03mg/kg，0.02 mg/kg，保质期为1 年，符合《GB27632021食品安全国家标准 食品中农药最大残留限量》对生乳中农药残留做出明确限量规定吡虫啉、吡唑醚菌酯、氟虫腈最大残留量0.1 mg/kg，0.03 mg/kg，0.02 mg/kg要求。[结论]该方法操作简单，快速灵敏，稳定准确，可以作为前期农残检测的快速筛查手段。 相似文献
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试验建立青贮玉米中4类6种(异丙甲草胺、氰戊菊酯、溴氰菊酯、氯氟氰菊酯、腐霉利、虫螨腈)农药残留的气相色谱检测方法。样品经组织捣碎,乙腈提取,振荡分层,弗罗里矽固相萃取柱净化,洗脱液于50℃氮吹至5 mL以下后用正己烷定容,过0.22μm有机系滤膜,采用RTX-5和wondacap-1色谱柱分离。结果表明:青贮玉米中的4类农药在0.02、0.06、0.10 mg/kg添加水平下的回收率为82.92%~105.83%,RSD值为2.44%~7.02%,方法的定量限是0.02 mg/kg。该方法样品前处理操作简便快捷、安全性高、准确度和灵敏度高,适用于青贮玉米中杀虫剂、杀菌剂、除草剂、杀螨剂4类农药残留的检测。 相似文献
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OBJECTIVE: To measure the amounts of pesticide residue in wool grown in Queensland between 1997 and 1999, and to describe the use of pesticides for the control of lice infestations and blowfly strike in Queensland sheep flocks. DESIGN: Pesticide residues were measured in a random sample of wool from Queensland clips offered for sale during 1998 and 1999. Information on pesticide use was obtained from a trace-back postal survey. PROCEDURE: Samples taken from wool lots were tested for the presence and amount of organophosphorus (OP), synthetic pyrethroid (SP) and insect growth regulator pesticides. A questionnaire seeking information on flock characteristics and pesticide use was sent to the manager of each flock from which a wool sample was tested. RESULTS: The mean amount of OP and SP residue was 2.0 and 0.8 mg/kg, respectively. Ninety-five and 98% of wool samples contained < 9 mg/kg and 7 mg/kg of OP and SP residues, respectively. The mean amount of cyromazine, diflubenzuron and triflumuron was 12.7, 5.8 and 13.0 mg/kg, respectively. The amounts of OP, cyromazine and triflumuron residues were greater in wool from flocks located in southern Queensland. CONCLUSION: Most (95%; 95% CI, 92-97%) Queensland wool clips grown between 1997 and 1999 meet the suggested Australian maximum acceptable residue amounts for OP and SP pesticides. 相似文献
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文中建立了凝胶渗透色谱净化-气相色谱法同时测定饲料中敌敌畏、乐果等30种有机磷农药残留的方法。饲料样品用乙腈体系提取,采用凝胶色谱柱净化,毛细管色谱柱分离(DB-50+,30 m×0.25 mm×0.25μm),火焰光度检测器(FPD)检测,外标法定量。其方法检测限为5.6~54μg/kg,三水平添加回收率为71.3%~114.1%,RSD为0.3%~14.8%。方法简便、准确,并能满足饲料中多种有机磷农残测定的需要。 相似文献
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建立了乳与乳制品中20种邻苯二甲酸酯气相色谱-质谱联用仪分析方法.样品用正己烷提取后,采用DB-5MS(30m×0.25mm,0.25μm)石英毛细管柱分离,在进样口温度280℃,传输线温度280℃,离子源温度230℃条件下20种邻苯二甲酸酯完全分离.该方法各组分的相关系数均大于0.9990,线性范围0～10μg/mL,样品加标回收率为80％～109％.邻苯二甲酸二异壬酯、邻苯二甲酸二异癸酯化合物检出限分别为1.0、0.5mg/kg,其他化合物均为0.05mg/kg.该方法具有简单易行,快速准确,灵敏度高等优点. 相似文献
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Objective To determine practices for control of louse infestation and blowfly strike in Queensland sheep flocks that are associated with organophosphorous and synthetic pyrethroid residues on wool.
Design Information on residues was obtained from a survey of Queensland wool clips. Information on pesticide use was obtained from a trace-back postal survey. The association between pesticide use and residues was assessed using generalised linear models, controlling for potential confounding by flock location.
Procedure Between 1995 and 1997 Queensland wool clips were randomly sampled. Samples were tested for the presence and amount (mg per kg of greasy wool) of organophosphorous and synthetic pyrethroid pesticides. A questionnaire seeking information on flock characteristics and pesticide use was sent to the manager of each flock from which a wool sample was tested.
Results The median amount of OP and SP residue was 0.8 and 0.25 mg/kg, respectively, and 91 and 95% of wool samples contained < 8 mg/kg of OP and SP residues, respectively. The frequency of OP pesticide use for louse control was significantly (P = 0.005) associated with mean OP residue amount, and the timing of SP use for louse control, in relation to shearing, was significantly (P < 0.001) associated with mean SP residue amount.
Conclusion Most Queensland wool clips have acceptable amounts of residues after the use of OP and SP pesticides, but wool growers can further reduce residues by effectively controlling louse infestation with pesticide applications early after shearing and the use of non-chemical methods of ectoparasite control. 相似文献
Design Information on residues was obtained from a survey of Queensland wool clips. Information on pesticide use was obtained from a trace-back postal survey. The association between pesticide use and residues was assessed using generalised linear models, controlling for potential confounding by flock location.
Procedure Between 1995 and 1997 Queensland wool clips were randomly sampled. Samples were tested for the presence and amount (mg per kg of greasy wool) of organophosphorous and synthetic pyrethroid pesticides. A questionnaire seeking information on flock characteristics and pesticide use was sent to the manager of each flock from which a wool sample was tested.
Results The median amount of OP and SP residue was 0.8 and 0.25 mg/kg, respectively, and 91 and 95% of wool samples contained < 8 mg/kg of OP and SP residues, respectively. The frequency of OP pesticide use for louse control was significantly (P = 0.005) associated with mean OP residue amount, and the timing of SP use for louse control, in relation to shearing, was significantly (P < 0.001) associated with mean SP residue amount.
Conclusion Most Queensland wool clips have acceptable amounts of residues after the use of OP and SP pesticides, but wool growers can further reduce residues by effectively controlling louse infestation with pesticide applications early after shearing and the use of non-chemical methods of ectoparasite control. 相似文献