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1.
采用水浴湿法消化，以Ｐd（ＮＯ３）２－ＴritonＸ－１００作为基体改进剂，应用Ｚeeman石墨炉原子吸收法测定了肝组织硒含量。试验结果表明，肝组织经水浴湿法消化测得的硒 含量与消化测定结果基本一致（Ｐ〉０．０５），相对标准偏差为１．１１％，回收率为９５．８０％～１００．４０％。石墨炉原子吸收法测定硒的检测限为５．０ug/Ｌ。 相似文献
2.
采用原子吸收分光光度计石墨炉法测定青海省共和县倒淌河镇羊血清中微量元素铜、锰元素含量。羊血清经过湿法消解前处理,石墨炉法测定铜、锰元素含量。经过实验测定,得到铜、锰R值分别为0.9992,0.9997标准曲线,加标回收率在96.3%～98.5%之间。结果表明,原子吸收石墨炉法能够满足羊血清中微量元素铜、锰含量的测定。 相似文献
3.
测定微量元素硒的常用方法有荧光法、原子吸收法和比色法等,荧光法虽然准确但繁琐,不仅所用试剂DAN毒性大而且需进口;原子吸收法火焰法灵敏度低,石墨炉法有严重的基体干扰;比色法虽然简便但灵敏度低,原子荧光法是一种简便及灵敏度高的方法.用原子荧光法测定饲料添加剂及预混料中微量元素硒,硒的相对标准偏差为1.2%,检出限为0.4 ng/mL,线性范围为0～400 ng/mL,相关系数为0.999 91,回收率为96.1%～101.8%. 相似文献
4.
本实验旨在建立检测饲料中镉含量的石墨炉原子吸收光谱法,并对测定条件进行优化选择,以实现快速、准确检测。采用干灰化法对饲料样品进行前处理,在228.8 nm共振线,采用塞曼校正,应用石墨炉原子吸收法测定饲料中镉含量。结果表明:镉浓度为0~2μg/L时,线性关系良好,相关系数为0.9986;方法检出限为0.0255μg/L;精密度(RSD)为0.603%(n=11);加标回收率为99.84%~102.0%。石墨炉原子吸收法具有操作简便、快速、灵敏度高等特点,并有较高的回收率,能适用于饲料中镉含量的测定。 相似文献
5.
硒是哺乳动物必需的微量元素,动物缺硒会得“白肌病”．但是许多含硒化合物都有很高的毒性。在饲料生产过程中．人们常在预混料中加入适量的含硒化合物,来满足动物生长发育的需要。如果饲料中硒含量过高,动物将出现中毒病状,严重者甚至死亡。因此．测定饲料中的硒含量显得十分重要。目前国际上对饲料中硒的测定方法采用2,3-二氨基荼荧光法。笔者通过反复摸索采用湿法处理饲料样品．用石墨炉原子吸收法测定其中硒的含量,取得较满意的结果。 相似文献
6.
本文研究用石墨炉原子吸收分光光谱仪测定饲料原料及成品中硒含量的方法。用Pd(NO_3)_2作为基体改进剂,重点研究了基体改进剂的体积、灰化温度和原子化温度对吸光值的影响,同时以此为基础建立了饲料中硒的优化分析方法。此方法中硒含量在0~100μg/L成线性关系,检测限为0.33μg/kg,回收率为95.0%~105.3%。该方法具有简单、灵敏、准确的优点,适合饲料原料和成品中硒的含量分析。 相似文献
7.
实验对比研究了塞曼效应石墨炉原子吸收法测定饲料样品中硒含量。以硝酸钯(Pd(NO3)2)、三氯醋酸(TCA)、及Pd(NO3)2+TCA作为基体改进剂可使吸光度分别增加4倍、15倍及21倍,检出下限分别为20μg/ml、8μg/ml、6μg/ml。以塞曼效应扣除背景吸收,能有效地克服Fe2+、Cu2+、Mn2+等共存离子的干扰。通过对不同类型饲料中硒含量检测可知,混合型的基体改进剂能够提高硒含量测定的灵敏度及回收率。 相似文献
8.
建立了石墨炉原子吸收法测定饲料中镉含量的方法。此方法回收率92%～98%,变异系数1.95%,前处理简便,结果准确。 相似文献
9.
测定微量元素硒的常用方法有荧光法、原子吸收法和比色法等，荧光法虽然准确但繁琐，并且所用试剂DAN毒性大且需进口；原子吸收法、火焰法灵敏度低，石墨炉法有严重的基体干扰；比色法虽然简便但灵敏度低。原子荧光法测定硒能克服以上方法的缺点，是一种简便、灵敏度高的方法。此文采用原子荧光法测定饲料添加剂及预混料中微量元素硒，硒的相对标准偏差为1．2％，检出限为0．4ng／mL，线性范围为0ng／mL－400ng／mL，相关系数为0.99991，回收率为96．1％－101．8％。 相似文献
10.
采用微波制样技术对样品进行消解,减少了消化过程中硒的损失,利用石墨炉原子吸收光谱法对醋酸地塞米松中微量硒进行测定.以4 mg/mL Pd(NO3)2作为基体改进剂,灰化温度为950 ℃,原子化温度为2 100 ℃时,经氘灯校正背景,测定硒含量,回收率在89.24%～112.37% 之间,方法的相对标准偏差为7.42%,检出限为0.53 ng/mL.该法具有简便、快速、灵敏、稳定、准确等优点,适用于醋酸地塞米松中微量硒的分析测定. 相似文献
12.
In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario. Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously. 相似文献
14.
Ovine scrapie was first recorded in Cyprus in 1985. Subsequently four dairy goats kept in two mixed flocks with affected sheep developed characteristic clinical signs similar to those seen in sheep. Fifteen goats from the two flocks were examined histologically and neurological lesions consistent with a diagnosis of scrapie were found in the four animals and in three others which had subsequently developed early neurological signs. These lesions were similar to those of naturally-affected sheep although neuronal degeneration and vacuolation were more severe in some cases. 相似文献
15.
In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%). Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada. 相似文献
16.
In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%). 相似文献
17.
In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection. 相似文献
19.
In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium. 相似文献
20.
In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated. Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively. 相似文献
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