原子吸收法测定蜂蜜中铅含量

研究原子吸收分光光度测定蜂蜜中铅含量的分析检测方法。实验表明,采用灰化法处理蜂蜜样品,用石墨炉原子吸收法测定蜂蜜的铅,精密度好,精确度高,能够满足日常分析要求。     

光控石墨炉原子吸收法测定蜂蜜中微量铅的研究

本文探讨了光控石墨炉原子吸收法测定蜂蜜中微量铅的条件,各种因素对测定的影响,研究了光控可以降低蜂蜜基体的增感作用,用标准曲线法在简单稀释试样的情况下直接测定蜂蜜中的铅。结果表明,该方法简单、快速、灵敏度和精密度都达到较满意的程度。     

火焰原子吸收法测定蜂蜜微量元素的含量

收集了油菜蜜、紫穗槐蜜、土茯苓蜜、边荷枫蜜、板栗蜜等五种蜂蜜。利用火焰原子吸收法测定蜂蜜中Cu、Ca、Mn、Fe等微量元素的含量。结果显示,五种蜂蜜中,板栗蜜Fe、Cu、Ca元素的含量最高,其他四种蜂蜜含量相近。边荷枫蜂蜜的Mn元素含量最高。     

蜂蜜中铁铅镉相关性的研究

用原子吸收分光光度法测定蜂蜜中铁、铅、镉的质量分数 ,测定结果表明 ,铁与铅、铁与镉质量分数之间不存在相关关系     

蜂蜜的化学构成及微量元素

土耳其因有大片地域适宜养蜂而成为重要的蜂蜜生产国 ,大部分蜂蜜产于蜜源开花期。土耳其标准化协会规定花蜜和甘露蜜灰分的最大值分别为 0 6%和1 0 %。安纳托利亚东南部的蜂蜜已有人做过研究 ,然而 ,对蜂蜜中的无机物含量 ,迄今尚未有人做过调查 ,因此 ,测定这些数值就显得尤为重要了。材料与方法1 .试样 :3 0份蜜样 ,采自安纳托利亚东南部。2 .无机物分析 :用 1 0ｍｌ盐酸 ( 0 1Ｎ)进行灰化法处理 ,并用蒸馏水逐步稀释至 1 0 0ｍｌ,制备含钠、钾、钙、镁、铜、铁、锰、钴、锌和镍等离子的溶液。镁、铜、铁、锰、钴、锌和镍应用原子吸收…     

蜂蜜中残留重金属检测方法研究进展

蜂蜜中残留的重金属不仅会危害人体健康,而且也会给我国蜂产品出口带来严重障碍。近些年来,我国农业部和国家质量监督检验检疫总局对此加倍重视,采取了多项措施来规范蜂蜜市场。为顺应国内外蜂产品市场发展需求,科研人员陆续研发出多种蜂蜜中重金属残留检测方法,包括石墨火焰原子吸收法、原子荧光光谱法、电感藕合等离子体质谱法等,本文对这些检测方法进行介绍,以期为蜂蜜重金属检测技术的完善与发展提供参考。     

应用原子吸收光谱测定蜂蜜中铁的研究

本实验利用火焰原子吸收法测定蜂蜜中的铁。测量波长２４８．３ｎｍ，狭缝０．２ｎｍ，灯电流５．０ｍＡ，空气流量１０．０Ｌ／ｍｉｎ，乙炔流量２．００Ｌ／ｍｉｎ。样品经消解或灰化（５５０℃）等处理后导入火焰测定吸光度，与标准系列比较定量。测得蜂蜜样品中铁含量为４０．３μｇ／ｍｌ，ＲＳＤ％＝１．２９，回收率＝１００．４％。     

正交设计在石墨炉子吸收法测铅实验教学中的应用

在应用石墨炉原子吸收法测铅的实验教学中,通常需要结合特定原子吸收仪的具体条件确定仪器分析参数的取值.     

儿童吃蜂蜜的好处

蜂蜜是儿童喜爱的食品,它营养丰富,成熟的蜂蜜含75%的葡萄糖和果糖,可被人体直接吸收.蜂蜜还含有一定的矿物质、维生素、有机酸和芳香物质.它能促进小儿的食欲,调节胃肠,使胃酸分泌正常,帮助消化.蜂蜜还是一种有效的抗菌剂,它所含的抗菌素杀菌效力很大,具有消毒作用,可以保护儿童的牙齿.     

三中测定饲料中钙的含量的方法比较

饲料中的钙含量是饲料质量的重要指标,采用高锰酸钾法和EDTA法,原子吸收分光光度法测定饲料中钙含量.三种方法的结果都准确,相对偏差都在误差范围内.高锰酸钾法比较麻烦,EDTA法容易受到其他元素络合的影响.原子吸收分光光度法是比较方便,快速,准确度和精确度高的方法.     

中国饲料工业协会第五届理事会顾问、会长、常务副会长、副会长、秘书长、副秘书长、常务理事、理事名单

顾问刘中一张德邻宋瑞祥聂振邦张子仪戎易王维四会长白美清国务院原副秘书长、第四届理事会会长常务副会长(8人,以姓氏笔划为序)刘永好新希望集团董事长、第四届理事会副会长刘汉元通威股份有限公司董事长、第四届理事会副会长陈丹广东恒兴集团股份有限公司董事长、第四届理事会副会长张延喜农业部原副部长、第四届理事会副会长吴明夏湖南正虹科技发展股份有限公司董事长、第四届理事会副会长陶一山唐人神集团股份有限公司董事长、第四届理事会副会长温鹏程广东温氏食品集团有限公司董事长、第四届理事会副会长谭竹洲原化学工业部副部长、第…     

Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog

Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum.     

The influence of the width of the saddle tree on the forces and the pressure distribution under the saddle

As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks.     

浅谈对症用药

对症用药就是通过对患病信鸽的症状进行诊断,进而确定病属,选择药物及如何用药的方法。     

军犬鉴别中的嗅源培养和易出现的问题及对策

嗅源是军犬嗅觉作业训练的依据.军犬鉴别中嗅源能力的培养在整个鉴别训练中占有重要地位,关系到鉴别训练的成败和鉴别能力的提高.所以,军犬在嗅认嗅源时必须按照训犬员的指令充分、细致地感受嗅源气味,并且对嗅源气味产生兴奋反应.如何培养军犬充分嗅认嗅源以及及时解决嗅认过程中出现的问题,成为我们进行鉴别训练的关键.……     

Observations on the Pathology of the Spleen of the Cat

Abstract— Lesions were found in the spleen of four of sixty-three cats examined post mortem in the department, and comprised two examples of lymphosarcoma, one of chronic fibrinous peritonitis and one of subcapsular haematoma. Abnormalities were found in two cat spleens received from veterinary surgeons in general practice. In one cat the abnormalities were an haemangiosarcoma with secondary deposits in the liver and in the other extensive mast cell infiltration. In addition lesions were detected in the spleen of three of eighty-seven cats examined post mortem in general practice. The lesions were: multiple secondary deposits of adenocarcinoma from a primary tumour of the mammary gland, a ruptured spleen and a foreign body below the splenic capsule. Résumé— L'examen microscopique de soixante-trois chats pratiqué dans le service a permis de rencontrer quatre fois des lésions de la rate, dont deux lymphosarcomes, une péritonite capsulaire fibrineuse et un hématome sous-capsulaire. D'autre part des lésions ont été trouvées dans deux rates de chat expédiées par des vétérinaires exerçant en pratiaue générale. Chez un chat il s'agissait d'un htmangiosarcome avec métastases hépatiques et chex l'autre d'une infilt ation diffuse par des mastocyta. De plus, on a rencontré des llésions dnas la rate de trois chats parmi quatre-vingt sept autopsies effectuées dans le cadre d'une clientèle génárale. Ces iésions étaient dés métastases multiples d'un adénocarcinome dont la tumeur primitive siègeait dam la glande mammaire, une rupture de la rate et un corps érangers sou capsulaire. Zusammenfassung— Läsionen der Milz wurden bei vier von dreiuiidsechzig in dieser hbteilung sezierten Katzen gefunden, und zwar in zwei Fällen ein Lymphosarkom, in einem Falle eine chron-ische fibrinöse Peritonitis und in einem ein subkapsuläres Hématom. Anomalien fanden sich auch in der Milz von zwei Katzen, die aus der tierxrztlichen Praxis eingesandt wurden. Bei der einen Katze war dies ein Hämangiosarkom mit Metastasen in der Leber, bei der anderen eine weitläufige Infiltration der Mastzellen. Außerdem wurden bei drei von siebenundachtzig in der Praxis sezierten Katzen Milzläsionen gefunden. Diese bestanden am multiplen Metastasen eines Adenokarzinoms der Brustdrüse, einer Milzzerreissung und einem Fremdkörper unterhalb der Milzkapsel.