CN105388153A - 一种戊二醛中甲醛的快速定性分析方法 - Google Patents

一种戊二醛中甲醛的快速定性分析方法 Download PDF

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CN105388153A
CN105388153A CN201510939229.6A CN201510939229A CN105388153A CN 105388153 A CN105388153 A CN 105388153A CN 201510939229 A CN201510939229 A CN 201510939229A CN 105388153 A CN105388153 A CN 105388153A
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formaldehyde
glutaraldehyde
reagent
qualitative analysis
solution
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赵立群
倪杰
汤楚莹
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HUBEI WEIKONG BIOTECHNOLOGY CO Ltd
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HUBEI WEIKONG BIOTECHNOLOGY CO Ltd
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    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/78Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour

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Abstract

本发明公开了一种戊二醛中是否含甲醛的快速定性分析方法,它解决了现有技术存在仪器昂贵、程序复杂等问题,其特征在于:配制希夫试剂和一定浓度强酸溶液,将样品与希夫试剂反应,再加强酸溶液,即可根据溶液颜色是否变化来判定试样中有甲醛存在。此方法可在3分钟内分析出戊二醛中是否含有质量分数0.1%以上的甲醛。

Description

一种戊二醛中甲醛的快速定性分析方法
技术领域
本发明涉及一种戊二醛中甲醛的快速定性分析方法,。
背景技术
戊二醛是一种杀菌剂、消毒剂,低毒、易降解,广泛应用于工业水处理、医用消毒、养殖消毒等领域。甲醛是一种强致癌物质,价格低廉,受利益驱动,有商家在戊二醛中加入5~20%甲醛降低成本,存在极大的环境和健康风险。传统的戊二醛分析方法有:化学滴定法、气相色谱法、高压液相色谱法等,其中化学滴定法不能区分甲醛和戊二醛;气相色谱法和高压液相色谱法仪器昂贵,样品前期处理复杂,难以推广应用。业界一直努力寻找一种准确方便的方法鉴别戊二醛产品中是否混有甲醛,用于戊二醛打假。
发明内容
本发明的目的在于提供一种简捷、快速、准确,能在终端客户现场进行的定性分析戊二醛中是否含0.1%以上甲醛的分析方法。
本发明的技术解决方案是:利用戊二醛样品先与希夫试剂反应,再加入强酸来判定试样中有质量分数大于0.1%的甲醛存在。具体步骤如下:
(1)取5ml希夫试剂,加3滴戊二醛样品,摇匀后30~40秒后溶液呈粉红色;
(2)向上述溶液中加入2ml强酸溶液,摇匀,30~40秒后溶液由粉红色变为无色,即可判定样品中没有含量大于0.1%的甲醛;溶液由粉红色变为蓝紫色,即可判定样品中有含量大于0.1%的甲醛。
所述希夫试剂的配制方法即可为:1000ml蒸馏水、0.5ml浓盐酸、0.01g碱性品红,0.5g亚硫酸钠依次加入烧杯中,用玻璃棒搅拌均匀,转移至试剂瓶,在3天后、180天内使用。
所述希夫试剂的配制方法也可为:1000ml蒸馏水、0.25ml浓硫酸、0.01g碱性品红,0.5g亚硫酸钠依次加入烧杯中,用玻璃棒搅拌均匀,转移至试剂瓶,在3天后、180天内使用。
所述强酸溶液为18~20%盐酸或24~26%硫酸。
本发明的有益效果在于:由于碱性品红是一种红色染料,通二氧化硫于其溶液中则得希夫试剂,与醛类作用,显色,且很灵敏,甲醛与希夫试剂所显的颜色加酸后不消失,而其他醛所显的颜色则褪去,因此,希夫试剂可用于区别甲醛和其他醛。具有显色快速、明显,保质期达180天,可现场及时判别戊二醛中是否含0.1%以上的甲醛。
具体实施方式
首先,按以下方法配制希夫试剂:1000ml蒸馏水、0.5ml浓盐酸或0.25ml浓硫酸、0.01g碱性品红,0.5g亚硫酸钠依次加入烧杯中,用玻璃棒搅拌均匀,转移至试剂瓶,在3天后、180天内使用。
其次,将浓盐酸或浓硫酸稀释成18~20%盐酸或24~26%硫酸。
然后,取以上两种试剂各25ml,25ml比色管1支,5ml、2ml移液管各1支,吸球1个,滴管1支,在任何场所即可进行以下分析。
最后,用吸球和5ml移液管将5ml希夫试剂移入25ml比色管,用滴管加3滴戊二醛样品到比色管中,摇匀后30~40秒后溶液呈粉红色;用吸球和2ml移液管向上述溶液中加入2ml强酸溶液,摇匀。5秒内溶液由粉红色变为无色,40秒后溶液仍为无色,可判定样品中没有有含量大于0.1%的甲醛存在。30~40秒内溶液由粉红色变为蓝紫色,可判定样品中有含量大于0.1%的甲醛存在。蓝紫色越深,样品中甲醛含量越高。

Claims (4)

1.一种戊二醛中是否含甲醛的快速定性分析方法,其特征在于:利用戊二醛样品先与希夫试剂反应,再加入强酸来判定试样中有质量分数大于0.1%的甲醛存在,具体操作步骤如下:
(1)取5ml希夫试剂,加3滴戊二醛样品,摇匀后30~40秒后溶液呈粉红色;
(2)向上述溶液中加入2ml强酸溶液,摇匀,30~40秒后溶液由粉红色变为无色,即可判定样品中没有含量大于0.1%的甲醛;溶液由粉红色变为蓝紫色,即可判定样品中有含量大于0.1%的甲醛。
2.根据权利要求1所述的快速定性分析方法,其特征在于:所述希夫试剂的配制方法为:1000ml蒸馏水、0.5ml浓盐酸、0.01g碱性品红,0.5g亚硫酸钠依次加入烧杯中,用玻璃棒搅拌均匀,转移至试剂瓶,在3天后、180天内使用。
3.根据权利要求1所述的快速定性分析方法,其特征在于:所述希夫试剂的配制方法为:1000ml蒸馏水、0.25ml浓硫酸、0.01g碱性品红,0.5g亚硫酸钠依次加入烧杯中,用玻璃棒搅拌均匀,转移至试剂瓶,在3天后、180天内使用。
4.根据权利要求1或2或3所述的快速定性分析方法,其特征在于:所述强酸溶液为18~20%盐酸或24~26%硫酸。
CN201510939229.6A 2015-11-30 2015-11-30 一种戊二醛中甲醛的快速定性分析方法 Pending CN105388153A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106841193A (zh) * 2017-01-27 2017-06-13 广州能源检测研究院 一种测试溶液的制备方法及应用该测试溶液测试甲醛浓度的方法

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CN201637676U (zh) * 2010-01-08 2010-11-17 新疆农业大学 食品掺甲醛快速检测试剂盒
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CN103217419A (zh) * 2013-04-08 2013-07-24 陕西理工学院 水产品甲醛含量的快速检测方法
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CN201637676U (zh) * 2010-01-08 2010-11-17 新疆农业大学 食品掺甲醛快速检测试剂盒
CN102175671A (zh) * 2010-12-22 2011-09-07 北京理工大学 一种适合于家庭居室空气中快速测定甲醛的品红试剂
CN103217419A (zh) * 2013-04-08 2013-07-24 陕西理工学院 水产品甲醛含量的快速检测方法
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106841193A (zh) * 2017-01-27 2017-06-13 广州能源检测研究院 一种测试溶液的制备方法及应用该测试溶液测试甲醛浓度的方法

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