WO2020029211A1 - 一种桑蚕丝绵制品中异味物质的仪器检测方法 - Google Patents

一种桑蚕丝绵制品中异味物质的仪器检测方法 Download PDF

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WO2020029211A1
WO2020029211A1 PCT/CN2018/099732 CN2018099732W WO2020029211A1 WO 2020029211 A1 WO2020029211 A1 WO 2020029211A1 CN 2018099732 W CN2018099732 W CN 2018099732W WO 2020029211 A1 WO2020029211 A1 WO 2020029211A1
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minutes
sample
detection method
silk cotton
temperature
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张珏
杭志伟
薛正元
朱亚伟
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Suzhou University
Nantong Textile and Silk Industrial Technology Research Institute
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Suzhou University
Nantong Textile and Silk Industrial Technology Research Institute
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02Column chromatography
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02Column chromatography
    • G01N30/04Preparation or injection of sample to be analysed
    • G01N30/06Preparation

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  • the invention belongs to the technical field of silk detection, and particularly relates to an instrument detection method for odor substances in mulberry silk cotton products.
  • the final silk fabric may produce a special, unspeakable and unpleasant odor, resulting in a decrease in the quality of the silk fabric and a lower value loss. Big.
  • test personnel who have been engaged in the test of the project for a long time should perform olfactory calibration once a month, and the calibration time should be shortened when a disease occurs or the project has not been tested for a long time.
  • the personnel's understanding of odor types, their familiarity, and individual factors (physical health, mood, state, etc.) will have a greater impact on the test results.
  • the sample to be tested because the odor is a fibrous product, the severity of the volatile odor is also different at different temperatures, different storage conditions, and at different time points.
  • the recommended standard GB / T24281 only specifies the 31 known volatile chemicals.
  • the 31 volatile chemicals are known to be toxic and harmful gases. It does not involve the connection between volatile substances and sensory odors, and it does not involve silk fabrics. The special unpleasant smell is not analyzed and detected for the specific substance of the odor source.
  • the invention discloses an instrument detection method for odorous substances in mulberry silk cotton products.
  • the instrument is used to replace the artificial detection of odors in silk fabrics, which greatly improves the scientificity, accuracy, repeatability, and detection limit of the detection results, and reduces the detection limit.
  • the work intensity of personnel has improved the detection accuracy.
  • the odor is a product of oxidation of residual emu oil, the initial stage of residual emu oil cannot be identified under artificial smelling conditions. Accelerating the oxidation of emu oil by appropriate pre-treatment methods, the use of high-sensitivity instruments can identify the residual emu oil. It plays a role of early warning of the odor of silk fabrics, and advances the detection step from the finished product to the raw materials, and prevents the loss of the value of the commodity caused by the odor.
  • An instrument detection method for odorous substances in mulberry silk cotton products includes the following steps:
  • the silk cotton products to be tested are placed at 40 ° C for 220-250 minutes, and then placed in a headspace sample bottle to obtain a sample bottle to be tested;
  • the off-odor substance was 1,2-dimethylhydrazine (CAS No: 540-73-8).
  • the invention also discloses an instrument quantitative detection method for odor substances in mulberry silk cotton products, which includes the following steps:
  • the invention discloses for the first time an instrument detection method for odorous substances in mulberry silk cotton products.
  • the odorous substance content is 1,2-dimethylhydrazine, which does not belong to the 31 volatile chemical substances involved in the existing standards.
  • the mass spectrometry response value of the sample to be tested is brought into the mass spectrometry response value-concentration standard curve of odorous substances, which can accurately detect the concentration of odorous substances in the sample to be detected, and obtain objective, fair and accurate quantitative results.
  • the preparation method of the mass spectrum response value-concentration standard working curve is as follows:
  • the mass of non-polluting silkworm silk products is 0.50g; the standard working solution concentration is 10 ⁇ g / mL, 50 ⁇ g / mL, 200 ⁇ g / mL, 500 ⁇ g / mL, 1000 ⁇ g / mL; each blank sample vial is injected using a micro syringe 5 ⁇ L of the standard working solution, so that the concentration of 1,2-dimethylhydrazine in the standard working solution sample bottle was 0.1 mg / kg, 0.5 mg / kg, 2 mg / kg, 5 mg / kg, 10 mg / kg, respectively.
  • step (1) it is left at 40 ° C for 240 minutes, the water immersion time is 30 minutes, and the centrifugal dehydration condition is 10000 rpm for 5 minutes.
  • step (2) it is left at 40 ° C for 240 minutes; the water immersion time is 30 minutes, and the centrifugal dehydration condition is 10000 rpm for 5 minutes.
  • step (3) the conditions of the headspace solid-phase microextraction are: an adsorption heating temperature of 80 ° C, an adsorption time of 40 minutes, a desorption temperature of 200 ° C, and a desorption time of 10 minutes;
  • Capillary column DB-WAX 30m ⁇ 0.25mm ⁇ 0.5 ⁇ m;
  • the carrier gas is high-purity helium, and the constant flow rate is 1mL / min;
  • the inlet temperature is 200 ° C, and the injection is splitless;
  • Program temperature rise initial temperature 50 °C, hold for 3min, rise to 120 °C at 5.0 °C / min, hold 15min, increase to 200 °C at 10.0 °C / min, hold 2min;
  • the ion source temperature is 230 ° C and the transmission line temperature is 250 ° C;
  • the full scan range of the mass spectrum is 45 amu ⁇ 300amu, combined with SIM scanning 45.2amu, 59.0amu and other single ions.
  • the silk cotton product to be tested is 0.5 g
  • the pollution-free silk cotton product is 0.5 g.
  • the existing textile odor detection method is mainly the smell detection method.
  • One test requires the collection of 3 to 6 professionals, and there are tedious requirements for testing site equipment, personnel requirements, and whether the testing procedures are standardized. Even if everything meets the standard requirements, because The subjective sensitivity of personnel is different, and the test results obtained are also different.
  • the machine test method involves only 31 kinds of volatile chemicals, and does not involve the special bad smell of silk fabrics. According to this method, the chromatographic peaks detected in this experiment cannot be obtained with its parameter settings.
  • the instrument detection method for odorous substances in mulberry silk cotton products disclosed by the present invention is characterized in that the chromatographic peaks of odor sources of mulberry silk cotton products are found using SPME-GC / MS, and the correspondence between odors and specific chemical substances is revealed, and given The detection scheme.
  • the present invention has the advantages of accurate quantification, good reproducibility, high recovery rate of odorous substances, simple operation, reduced labor intensity, and low dependence on subjective judgment of professionals.
  • the invention establishes a new instrument detection method for odorous substances in mulberry silk cotton products, which can qualitatively and quantitatively measure 1,2-dimethylhydrazine in mulberry silk cotton products; the method of the present invention can pass mulberry silk cotton products Detection of odorous substances in mulberry silk cotton products;
  • the method of the present invention directly weighs a small amount of product and puts it in a headspace bottle to seal it for analysis.
  • the operation is very convenient, and no pretreatment such as grinding and pulverization is required. Compared with other methods, it can better maintain the morphological characteristics of the sample itself without generating Like other methods, the pre-treatment process causes losses to the target, improves the sensitivity of the analysis, and greatly reduces the time required for oxidative denaturation.
  • the invention uses a solid-phase micro-extraction SPME automatic injection needle, which has better adsorption and enrichment of odorous substances, does not require complete extraction of the target substance, and does not require organic solvent extraction and injection. Under the operating conditions of the present invention, such as extraction Time and temperature and desorption time and temperature can accurately and effectively obtain odorous substances. .
  • FIG. 1 is a chromatogram of 1,2-dimethylhydrazine
  • Figure 2 is a chromatogram of a blank sample
  • Figure 3 is a sample chromatogram of Comparative Example 1
  • Figure 4 is a standard curve plot between the mass spectrum response and the concentration
  • FIG. 5 is a chromatogram of a silkworm sample detected by a conventional method
  • FIG. 6 is a chromatogram of a silkworm sample detected by a conventional heating program.
  • the conditions of the headspace solid phase microextraction are: an adsorption heating temperature of 80 ° C, an adsorption time of 40min, a desorption temperature of 200 ° C, and a desorption time of 10min;
  • Capillary column DB-WAX 30m ⁇ 0.25mm ⁇ 0.5 ⁇ m;
  • the carrier gas is high-purity helium, and the constant flow rate is 1mL / min;
  • the inlet temperature is 200 ° C, and the injection is splitless;
  • Program temperature rise initial temperature 50 °C, hold for 3min, rise to 120 °C at 5.0 °C / min, hold 15min, increase to 200 °C at 10.0 °C / min, hold 2min;
  • the ion source temperature is 230 ° C and the transmission line temperature is 250 ° C;
  • the present invention modifies the above conditions as a comparative example.
  • An instrument detection method for odorous substances in mulberry silk cotton products includes the following steps:
  • 0.5g of silkworm silk product to be tested is immersed in water for 30 minutes, centrifuged at 10,000 rpm for 5 minutes, and then placed in an open beaker, placed at 40 ° C for 4 hours, and then moved into a headspace sample bottle to obtain a sample bottle to be tested ;
  • An instrument detection method for odorous substances in mulberry silk cotton products includes the following steps:
  • Example 1 Put 0.5g of silkworm silk product to be tested (Example 1) after soaking in water for 30 minutes, centrifugal dehydration at 10,000 rpm for 5 minutes, and then put it into an open beaker, place it at 40 ° C for 2 hours, and then move it into a headspace sample bottle. Get the sample bottle to be tested;
  • Example 2 a standard working solution sample bottle was prepared, in which the concentrations of 1,2-dimethylhydrazine were 1 mg / kg, 5 mg / kg, and 50 mg / kg, respectively.
  • the method of the present invention is different from GB / T 24281 in that GB / T 24281 uses a low-polarity chromatographic column DB-1 and the present invention uses a high-polarity chromatographic column DB-WAX; the GB / T 24281 sampling mode is 100 cm in area 2.
  • the present invention uses a weight mode; the SPME extraction head used in the national standard GB / T 24281 is inconsistent with this experiment; the national standard sample pretreatment method is inconsistent with the present invention, and the national standard is directly injected.
  • the present invention requires appropriate pretreatment.
  • the chromatogram obtained by the national standard method for the same sample is shown in Figure 5. It can be seen from the figure that the effective chromatographic peak of the odor source cannot be obtained.
  • the invention discloses an instrument detection method for the odor substance 1,2-dimethylhydrazine for the first time, which is different from the existing 31 kinds of volatile organic compounds, and uses a machine instead of manually detecting the odor of silk fabrics, which greatly improves the detection result.
  • the scientificity, accuracy, repeatability, and low detection limit reduce the work intensity of personnel and improve the detection effect.

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Abstract

一种桑蚕丝绵制品中异味物质的仪器检测方法,其利用SPME-GC/MS找到桑蚕丝绵制品的异味源色谱峰,指出异味源色谱峰与具体化学物质的对应关系,并给出检测方案。具有定量精准、重复性好,异味物质回收率高、操作简便、人员劳动强度降低、对专业人员主观判断依赖度低等优点。

Description

一种桑蚕丝绵制品中异味物质的仪器检测方法 技术领域
本发明属于蚕丝检测技术领域,具体涉及一种桑蚕丝绵制品中异味物质的仪器检测方法。
背景技术
蚕茧缫丝过程中由于现有技术无法完全去除蛹油,残留的蛹油氧化变性,最终的丝织品有可能产生一股特殊的、难以言表的难闻气味,导致丝织品的品质下降,价值损失较大。
针对纺织品的异味,我国目前有以下标准,包括GB18401-2010《国家纺织产品基本安全技术规范》、GB/T28024-2011《絮用纤维制品通用技术要求》、GB/T 18885-2009《生态纺织品技术要求》和FZ/T20027-2014《羊绒制品异味测定方法》等。这些标准中规定了异味的种类,包括霉味、高沸程石油味(汽油味、煤油味、柴油味等)、鱼腥味、芳香烃味、动物纤维膻味臊味等。目前对于异味检测主要以专业人员在特定环境、按要求以人工嗅闻的方法进行。国家推荐标准GB/T24281-2009《纺织品 有机挥发物的测定 气相色谱-质谱法》提出了一种用仪器代替人工检测纺织品有机挥发物的测定方法,测定纺织品中31种挥发物质。
现有人工嗅闻的方法存在着人员要求高、人为因素影响大、对检测人员身体健康不利等因素。异味检验问题主要是人员、物品和环境随时都在变化,导致结果差异较大。以环境和人员因素而言,标准对实验室的设备和材料、检测环境、试样准备、检验程序等都做了详尽的要求,尤其对检测人员要求包括身体健康,嗅觉正常,不吸烟,不酗酒;检测当天不使用带气味化妆品或护肤品,检测前洗手并用清水漱口去除口腔气味,并且规定了进入检测环境内需要进行2~3次深呼吸,然后静待10秒以适应检测环境等,还对检测人员的嗅觉校准提出了要求,规定长期从事该项目检测的试验人员一个月进行一次嗅觉校准,发生疾病或长期未从事该项目检测时应缩短校准时间等。人员对异味种类的理解、熟悉程度以及个体的因素(身体健康状况、情绪、状态等),对检验结果均会产生较大的影响。对待测样品而言,由于异味是纤维制品,在不同温度、不同保存条件和不同的时间节点,挥发出来的异味严重程度也不同。最后由于异味可能存在毒性和致病性,长期从事该工作对检测人员的健康造成潜在危险。推荐标准GB/T24281只是对已知的31种易挥发化学物质进行了明确规定,31种易挥发化学物质是已知的有毒有害气体,没有涉及易挥发物质与感官气味的联系,更没有涉及丝织品中特殊的难闻气味,没有对异味源的具体物质进行分析和检测。
技术问题
本发明公开了一种桑蚕丝绵制品中异味物质的仪器检测方法,用仪器代替人工检测丝织物的异味,极大地提高了检测结果的科学性、准确性、重复性和检测低限,降低了人员工作强度,提升了检测精确度。由于异味是残留蛹油氧化的产物,在人工嗅闻条件下尚不能鉴别出残留蛹油的初期,通过适当的前处理方法加速蛹油氧化,使用高灵敏度的仪器能够识别出残留蛹油,能够起到预警丝织品异味的作用,将检测步骤从成品提前到原料,起到防止异味产生的商品价值损失的作用。
技术解决方案
本发明采用如下技术方案:
一种桑蚕丝绵制品中异味物质的仪器检测方法,包括以下步骤:
(1)将待检测桑蚕丝绵制品经过水浸泡、离心脱水后于40℃放置220~250分钟,然后放入顶空进样瓶,得到待检测样瓶;
(2)将无污染桑蚕丝绵制品在沸水中煮沸30min,于120℃干燥20min,然后置于甲醇中超声萃取30min,空气中晾干后于120℃干燥20min,最后经过水浸泡、离心脱水后于40℃放置220~250分钟,然后放入顶空进样瓶,得到空白样瓶;
(3)分别以空白样瓶、待检测样瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得空白样色谱图、待检测样色谱图;
(4)比对空白样色谱图、待检测样色谱图,对出现差异的色谱峰进行NIST谱库检索,定性识别出异味物质质谱图、保留时间及其响应值,通过谱图筛查,识别出异味物质为1,2-二甲基肼(CAS No:540-73-8)。
本发明还公开了一种桑蚕丝绵制品中异味物质的仪器定量检测方法,包括以下步骤:
(1)将待检测桑蚕丝绵制品经过水浸泡、离心脱水后于40℃放置220~250分钟后,然后放入顶空进样瓶,得到待检测样瓶;
(2)以待测样品瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得待测样品的色谱图,根据质谱响应值-浓度标准工作曲线,计算得到1,2-二甲基肼的含量,完成桑蚕丝绵制品中异味物质的定量检测。
本发明首次公开了桑蚕丝绵制品中异味物质的仪器检测方法,测试出异味物质成份为1,2-二甲基肼,不属于现有标准中涉及的31种易挥发性化学物质;然后将待检测样品的质谱响应值带入异味物质质谱响应值-浓度标准曲线,可精确检测待检测样品中异味物质的浓度,取得了客观、公正、准确的定量结果。
本发明中,质谱响应值-浓度标准工作曲线的制备方法如下:
(1)将无污染桑蚕丝绵制品在沸水中煮沸30min,于120℃干燥20min,然后置于甲醇中超声萃取30min,空气中晾干后于120℃干燥20min;再经过水浸泡、离心脱水后于40℃放置220~250分钟,然后放入顶空进样瓶,得到空白样瓶;
(2)用甲醇将1,2-二甲基肼(CAS No:540-73-8)标准品稀释,得到不同浓度的标准工作溶液;将不同浓度的标准工作溶液以相同的体积分别加入空白样瓶中,得到标准工作溶液样品瓶;
(3)分别以空白样瓶、标准工作溶液样品瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得空白样色谱图、标准工作曲线色谱图,根据1,2-二甲基肼的质谱图、保留时间及其响应值,得到质谱响应值-浓度标准工作曲线;即质谱响应值与浓度之间的标准曲线。
比如,无污染桑蚕丝绵制品的质量为0.50g;标准工作溶液浓度为10μg/mL、50μg/mL、200μg/mL、500μg/mL、1000μg/mL;每个空白样瓶中使用微量注射器分别注入5μL的标准工作溶液,使得标准工作溶液样品瓶中1,2-二甲基肼的浓度分别为0.1mg/kg、0.5mg/kg、2mg/kg、5mg/kg、10mg/kg。
本发明中,步骤(1)中,40℃放置240分钟,水浸泡时间为30分钟,离心脱水条件为10000rpm脱水5分钟。
本发明中,步骤(2)中,40℃放置240分钟;水浸泡时间为30分钟,离心脱水条件为10000rpm脱水5分钟。
本发明中,步骤(3)中,顶空固相微萃取的条件为,吸附加热温度80℃,吸附时间40min,解吸温度200℃,解吸时间10min;
气相色谱-质谱的条件为:
毛细管色谱柱:DB-WAX 30m×0.25mm×0.5μm;
载气为高纯氦气,恒流流速为1mL/min;
进样口温度为200℃,不分流进样;
程序升温:初温50℃,保持3min,以5.0℃/min升至120℃,保持15min,以10.0℃/min升至200℃,保持2min;
离子源温度为230℃,传输线温度为250℃;
质谱全扫描范围是45amu~300amu,结合SIM扫描45.2amu、59.0amu等单离子。
优选的,待检测桑蚕丝绵制品为0.5g,无污染桑蚕丝绵制品为0.5g。
有益效果
现有的纺织品异味检测方法主要是嗅闻检测法,一次检测需要召集3~6名专业人员,对检测场地设备、人员要求、检测程序是否规范等有繁琐的要求,即使一切符合标准要求,由于人员的主观敏感性不同,得到的检测结果也有差异。机器检测法只涉及了易挥发性化学物质31种,不涉及丝织物的特殊难闻气味。根据该方法,其参数设置无法得到本实验中的检测色谱峰。本发明公开的桑蚕丝绵制品中异味物质的仪器检测方法特征在于,利用SPME-GC/MS找到了桑蚕丝绵制品的异味源色谱峰,揭示了异味与具体化学物质的对应关系,并给出了检测方案。与现有技术相比,本发明具有定量精准、重复性好,异味物质回收率高、操作简便、人员劳动强度降低、对专业人员主观判断依赖度低等优点。
本发明建立了一种新的桑蚕丝绵制品中异味物质的仪器检测方法,可以定性、定量测定桑蚕丝绵制品中异味物质1,2-二甲基肼;本发明方法可通过桑蚕丝绵制品中异味物质检测快速显示桑蚕丝绵制品中异味物质;      本发明方法直接称取少量的制品放入顶空瓶密封即可分析,操作很方便,不需要进行研磨粉碎等前处理,与其他方法相比可更好地保持样品本身形态特征,不会产生像其他方法前处理过程对目标物造成的损失,提高分析的灵敏度,并大大降低了氧化变性处理所需耗费的时间;      本发明使用固相微萃取SPME自动进样针,对异味物质有较好的吸附富集,不需要对目标物完全萃取、更不需要有机溶剂萃取进样,在本发明操作条件下,如萃取时间和温度、解吸时间和温度,可以准确有效的获取异味物质。。
附图说明
图1为异味物质1,2-二甲基肼的色谱图;
图2为空白样的色谱图;
图3为对比例一的样品色谱图;
图4为质谱响应值与浓度之间的标准曲线图;
图5为现有方法检测桑蚕丝样品的色谱图;
图6为现有升温程序检测桑蚕丝样品的色谱图。
本发明的实施方式
本实施例中,顶空固相微萃取的条件为,吸附加热温度80℃,吸附时间40min,解吸温度200℃,解吸时间10min;
气相色谱-质谱的条件为:
毛细管色谱柱:DB-WAX 30m×0.25mm×0.5μm;
载气为高纯氦气,恒流流速为1mL/min;
进样口温度为200℃,不分流进样;
程序升温:初温50℃,保持3min,以5.0℃/min升至120℃,保持15min,以10.0℃/min升至200℃,保持2min;
离子源温度为230℃,传输线温度为250℃;
45amu~300amu全扫描结合45.2amu、59amu单离子扫描。
本发明修改上述条件作为对比例。
实施例一
一种桑蚕丝绵制品中异味物质的仪器检测方法,包括以下步骤:
(1)将0.5g待检测桑蚕丝绵制品经过水浸泡30分钟、10000rpm离心脱水5分钟后放入敞口烧杯,于40℃放置4小时,然后移入顶空进样瓶,得到待检测样瓶;
(2)将0.5g无污染桑蚕丝绵在沸水中煮沸30min,于120℃干燥20min,然后置于甲醇中超声萃取30min,空气中晾干后于120℃干燥20min,经过水浸泡30分钟、10000rpm离心脱水5分钟后放入敞口烧杯,于40℃放置4小时,然后移入顶空进样瓶,得到空白样瓶;
(3)依次以空瓶、空白样瓶、待检测样瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得空白样色谱图、待检测样色谱图,空瓶用来校准;
(4)比对空白样色谱图、待检测样色谱图,得到异味物质质谱图、保留时间及其响应值,对照现有谱库,识别出异味物质为1,2-二甲基肼(CAS No:540-73-8),见图1,为异味物质1,2-二甲基肼的色谱图,保留时间为19.6min,图2为空白样图谱。
对比例一
一种桑蚕丝绵制品中异味物质的仪器检测方法,包括以下步骤:
(1)将0.5g待检测桑蚕丝绵制品(实施例一)经过水浸泡30分钟、10000rpm离心脱水5分钟后放入敞口烧杯,于40℃放置2小时,然后移入顶空进样瓶,得到待检测样瓶;
(2)将0.5g无污染桑蚕丝绵在沸水中煮沸30min,于120℃干燥20min,然后置于甲醇中超声萃取30min,空气中晾干后于120℃干燥20min,经过水浸泡30分钟、10000rpm离心脱水5分钟后放入敞口烧杯,于40℃放置2小时,然后移入顶空进样瓶,得到空白样瓶;
(3)依次以空瓶、空白样瓶、待检测样瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得空白样色谱图、待检测样色谱图,空瓶用来校准;
(4)比对空白样色谱图、待检测样色谱图,无法得到异味物质质谱图、保留时间及其响应值,见图3。
实施例二
(1)将五个0.50g无污染桑蚕丝绵制品在沸水中煮沸30min,于120℃干燥20min,然后置于甲醇中超声萃取30min,空气中晾干后于120℃干燥20min;再经过水浸泡、离心脱水后于40℃放置240分钟,然后分别放入顶空进样瓶,得到五个空白样瓶;
(2)用甲醇将1,2-二甲基肼(CAS No:540-73-8)标准品稀释,得到不同浓度的标准工作溶液,为10μg/mL、50μg/mL、200μg/mL、500μg/mL、1000μg/mL;每个空白样瓶中使用微量注射器分别注入5μL的标准工作溶液,得到标准工作溶液样品瓶,标准工作溶液样品瓶中1,2-二甲基肼的浓度分别为0.1mg/kg、0.5mg/kg、2mg/kg、5mg/kg、10mg/kg;
(3)依次以空瓶、空白样瓶、标准工作溶液样品瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得空白样色谱图、标准工作曲线色谱图,根据1,2-二甲基肼的质谱图、保留时间及其响应值,得到质谱响应值-浓度标准工作曲线;即质谱响应值与浓度之间的标准曲线,见图4,可以看到线性关系为0.97,表明SPME的萃取和解吸能力较好。
实施例三
根据实施例二的方法,制备标准工作溶液样品瓶,其中1,2-二甲基肼的浓度分别为1mg/kg、5 mg/kg和50mg/kg。
依次以空瓶、空白样瓶、标准工作溶液样品瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得空白样色谱图、标准工作曲线色谱图,根据1,2-二甲基肼的质谱图、保留时间及其响应值,得到质谱响应值,每样测定6次,然后计算平均回收率和相对标准偏差,带入质谱响应值-浓度标准工作曲线,得到1,2-二甲基肼的检测浓度,结果参见表1,所有添加水平的6份平行样回收率良好,标准偏差在4.4~5.8之间。
表1 平均回收率和标准偏差
Figure 917183dest_path_image001
本发明方法区别于GB/T 24281的特点在于,GB/T 24281采用了低极性色谱柱DB-1,本发明采用高极性柱DB-WAX;国标GB/T 24281的取样模式为面积100cm 2,本发明采用重量模式;国标GB/T 24281采用的SPME萃取头与本实验不一致;国标的样品前处理方式与本发明不一致,国标是直接进样,本发明需要进行适当前处理。相同样品,采用国标的方法取得的色谱图如图5所示,从图中可以看到,无法得到异味源的有效色谱峰。以现有程序升温条件一样无法检测出异味物质,比如采用“初温60℃,保持1min,以10℃/min升至100℃,再以40.0℃/min升至260℃,保持5min”的工艺,其余与实施例一相同,得到的谱图如图6。
本发明首次针对异味物质1,2-二甲基肼公开了一种仪器检测方法,这与现有31种易挥发有机物不同,并且用机器代替人工检测丝织物的异味,极大地提高了检测结果的科学性、准确性、重复性和检测低限,降低了人员工作强度,提升了检测效果。

Claims (10)

  1. 一种桑蚕丝绵制品中异味物质的仪器检测方法,包括以下步骤:
    (1)将待检测桑蚕丝绵制品经过水浸泡、离心脱水后于40℃放置220~250分钟,然后放入顶空进样瓶,得到待检测样瓶;
    (2)将无污染桑蚕丝绵制品在沸水中煮沸30min,于120℃干燥20min,然后置于甲醇中超声萃取30min,空气中晾干后于120℃干燥20min,最后经过水浸泡、离心脱水后于40℃放置220~250分钟,然后放入顶空进样瓶,得到空白样瓶;
    (3)分别以空白样瓶、待检测样瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得空白样色谱图、待检测样色谱图;
    (4)比对空白样色谱图、待检测样色谱图,对出现差异的色谱峰进行NIST谱库检索,定性识别出异味物质质谱图、保留时间及其响应值,通过谱图筛查,识别出异味物质为1,2-二甲基肼。
  2. 一种桑蚕丝绵制品中异味物质的仪器定量检测方法,包括以下步骤:
    (1)将待检测桑蚕丝绵制品经过水浸泡、离心脱水后于40℃放置220~250分钟后,然后放入顶空进样瓶,得到待检测样瓶;
    (2)以待测样品瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得待测样品的色谱图,根据质谱响应值-浓度标准工作曲线,计算得到1,2-二甲基肼的含量,完成桑蚕丝绵制品中异味物质的定量检测。
  3. 根据权利要求1或者2所述的检测方法,其特征在于,步骤(1)中,40℃放置240分钟,水浸泡时间为30分钟,离心脱水条件为10000rpm脱水5分钟;待检测桑蚕丝绵制品为0.5g。
  4.  根据权利要求1或者2所述的检测方法,其特征在于,顶空固相微萃取的条件为,吸附加热温度80℃,吸附时间40min,解吸温度200℃,解吸时间10min;
    气相色谱-质谱的条件为:
    毛细管色谱柱:DB-WAX 30m×0.25mm×0.5μm;
    载气为高纯氦气,恒流流速为1mL/min;
    进样口温度为200℃,不分流进样;
    程序升温:初温50℃,保持3min,以5.0℃/min升至120℃,保持15min,以10.0℃/min升至200℃,保持2min;
    离子源温度为230℃,传输线温度为250℃;
    质谱全扫描范围是45amu~300amu,结合SIM扫描45.2amu、59.0amu等单离子。
  5. 根据权利要求1所述的检测方法,其特征在于,步骤(2)中,40℃放置240分钟;水浸泡时间为30分钟,离心脱水条件为10000rpm脱水5分钟。
  6. 根据权利要求1所述的检测方法,其特征在于,无污染桑蚕丝绵制品为0.5g。
  7. 根据权利要求2所述的检测方法,其特征在于,质谱响应值-浓度标准工作曲线的制备方法如下:
    (1)将无污染桑蚕丝绵制品在沸水中煮沸30min,于120℃干燥20min,然后置于甲醇中超声萃取30min,空气中晾干后于120℃干燥20min;再经过水浸泡、离心脱水后于40℃放置220~250分钟,然后放入顶空进样瓶,得到空白样瓶;
    (2)用甲醇将1,2-二甲基肼标准品稀释,得到不同浓度的标准工作溶液;将不同浓度的标准工作溶液以相同的体积分别加入空白样瓶中,得到标准工作溶液样品瓶;
    (3)分别以空白样瓶、标准工作溶液样品瓶为进样瓶,使用顶空固相微萃取-气相色谱-质谱法,测得空白样色谱图、标准工作曲线色谱图,根据1,2-二甲基肼的质谱图、保留时间及其响应值,得到质谱响应值-浓度标准工作曲线;即质谱响应值与浓度之间的标准曲线。
  8. 根据权利要求7所述的检测方法,其特征在于,无污染桑蚕丝绵制品为0.5g;标准工作溶液浓度为10μg/mL、50μg/mL、200μg/mL、500μg/mL、1000μg/mL;标准工作溶液样品瓶中1,2-二甲基肼的浓度分别为0.1mg/kg、0.5mg/kg、2mg/kg、5mg/kg、10mg/kg。
  9. 根据权利要求7所述的检测方法,其特征在于,顶空固相微萃取的条件为,吸附加热温度80℃,吸附时间40min,解吸温度200℃,解吸时间10min;
    气相色谱-质谱的条件为:
    毛细管色谱柱:DB-WAX 30m×0.25mm×0.5μm;
    载气为高纯氦气,恒流流速为1mL/min;
    进样口温度为200℃,不分流进样;
    程序升温:初温50℃,保持3min,以5.0℃/min升至120℃,保持15min,以10.0℃/min升至200℃,保持2min;
    离子源温度为230℃,传输线温度为250℃;
    质谱全扫描范围是45amu~300amu,结合SIM扫描45.2amu、59.0amu等单离子。
  10. 顶空固相微萃取-气相色谱-质谱设备在桑蚕丝绵制品中异味物质的仪器检测中的应用。
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