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石墨炉原子吸收法直接测定食盐中铅含量

目前用基体改进剂消除基体干扰是石墨炉原子吸收光谱法首选应用内容,本文用氯化钯作基体改进剂,提高测定中的灰化温度,减少测定食盐中铅时的基体干扰,提高测定方法的准确性。

旋光法测试味精中谷氨酸钠的含量- 佳航旋光仪应用方案

原理味精中谷氨酸钠含量是味精行业的一个重要指标,其含量的高低直接决定味精的好坏。谷氨酸钠分子结构中有不对称原子,具有光学活性,因此用旋光仪测定其溶液旋光度,便可换算出谷氨酸钠的含量。

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全自动旋光仪

全自动旋光仪

型号:JH-P300

ASE提取IC-ICPMS 联用测定茶叶中的三价和六价铬

摘要:方法采用快速溶剂萃取ASE提取茶叶中的三价和六价铬,并用ICS3000离子色谱与ICPMS联用ce定。样品使用0.04 mol/L EDTA二钠盐和硝酸铵溶液(ph为7.0~7.5)在80℃和1600 psi压力下提取,提取液冷却后8000rpm离心并用0.45 um膜过滤。以0.075mol/L的硝酸铵作为流动相,AG7色谱柱分离后用ICPMS测定。

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产品

茶叶中氯噻啉的测定

采用Leapsil色谱柱结合UPLC-MS/MS,按照标准采用ProElut Carb/NH2固相萃取柱净化,方法定量限为5.0μg/kg

海能仪器:微波消解-石墨炉原子吸收法测定稻米中的镉

通过微波消解方法对稻米样品进行前处理,有利于后续原子吸收对样品中镉元素含量的快速准确测定。

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产品
微波消解仪厂家

微波消解仪厂家

以He/Ar为载体的Dumas法测定坚果中的N/蛋白质含量

以He/Ar为载体的Dumas法测定坚果中的N/蛋白质含量。RSD证明,使用氦或氩作为载气,在相同的条件(方法和样品重量)下,结果是非常可靠和可重复的;2.0%相对标准偏差,按方法要求。氩是现有的较好替代品,已被证明是一种有效的替代品,确保了优异的效果。VELP NDA 702双载气Dumas氮分析仪以氦气和氩气为载气,对简单、快速和准确的氮/蛋白质测定具有完美的反应。

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产品
意大利VELP-杜马斯定氮仪

意大利VELP-杜马斯定氮仪

型号:NDA702

包装饮用水中阴阳离子的测定

中国饮用天然矿泉水国家标准规定:饮用天然矿泉水是从地下深处自然涌出的或经人工 揭露的未受污染的地下矿泉水;含有一定量的矿物盐、微量元素和二氧化碳气体;在通常情 况下,其化学成份、流量、水温等动态在天然波动范围内相对稳定。为保证饮用者的安全, 规范市场秩序,检测矿泉水中阴阳离子具有重要的意义。

推荐
产品
盛瀚CIC-D100离子色谱仪

盛瀚CIC-D100离子色谱仪

型号:CIC-D100

月饼中铅、镉的含量检测

本方法采用微波消解做前处理后,用石墨炉原子吸收法直接进行月饼中铅、镉含量的测定。同火焰原子吸收法相比,方法更灵敏、准确。

推荐
产品
40位智能高通量微波消解系统

40位智能高通量微波消解系统

型号:MD6

AT1000电位滴定仪在食品行业盐类检测中的应用

盐(NaCl)存在于许多食品中,如肉类、罐头产品、方便食品以及奶制品等,盐的添加有助于延长食品的保质期,改善食物的外观和味道。在食品研发、生产和质量控制的整个流程中,不管是原材料还是最终产品,均需要对其盐含量进行检测。因此,盐类检测是食品行业很常见的检测指标之一。

液体食品包装卫生性能的监测及解决方案

本文介绍了酸奶此类高脂肪酸性液体食品所使用包装袋中高锰酸钾消耗量、蒸发残渣、重金属、脱色试验这四项重点卫生性能,并详细介绍了蒸发残渣仪的检测原理、试验步骤及应用,可为行业内包装材料蒸发残渣的测试提供参考。

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