超高效液相色谱-串联质谱法同时测定食品中的氯酸盐和高氯酸盐残留量

目的 建立了超高效液相色谱-串联质谱法测定食品中氯酸盐和高氯酸盐残留量的方法。方法 食品样品经纯水溶解,乙腈提取,固相萃取柱净化,超高效液相色谱-串联质谱测定。采用多反应监测模式,电喷雾电离源负离子模式,内标法定量。结果 氯酸盐在0~200 ng/mL、高氯酸盐在0~100 ng/mL范围内线性关系良好,相关系数(r)均大于0.99,检出限(S/N=3)为氯酸盐6.0μg/kg和高氯酸盐1.0 μg/kg,定量限(S/N≥10)为氯酸盐18.0μg/kg和高氯酸盐3.0 μg/kg。以不含氯酸盐和高氯酸盐的样品作为空白样品进行添加回收试验,氯酸盐的回收率为83.7%~106.9%,相对标准偏差(RSD)为2.9%~6.2%,高氯酸盐的回收率为87.8%~112.8%,相对标准偏差(RSD)为2.9%~7.5%。结论 该方法不但可以有效排除复杂基体的干扰,而且简单、灵敏、稳定。     

液相色谱-串联质谱法测定饮用水中的卤氧化物

目的建立一种液相色谱-串联质谱(liquid chromatography-tandem mass spectrometry,LC-MS/MS)同时检测饮用水中3种卤氧化物(高氯酸盐、氯酸盐及溴酸盐)的分析方法。方法水样直接经0.22μm水系滤膜过滤,采用100 mmol/L乙酸铵(A)和乙腈(B)作为流动相进行等度洗脱,经IC-Pak~(TM) Anion HR色谱柱分离,质谱(ESI-)采用多离子检测模式(MRM)对3种卤氧化物的定量离子和定性离子进行监测。结果本方法在6min内即完成3种目标化合物的分离分析。高氯酸盐及溴酸盐在0.5~50μg/L浓度范围内线性良好、氯酸盐在0.5~100μg/L浓度范围内线性良好(r≥0.999)。添加浓度为0.5、10.0、50.0μg/L,实验结果表明高氯酸盐、氯酸盐及溴酸盐的回收率可达84.8%~101.4%,相对标准偏差均小于10.0%(n=6)。高氯酸盐、氯酸盐及溴酸的检出限分别为0.1、0.2、0.2μg/L。结论该方法快速、准确、灵敏,适合测定饮用水中高氯酸盐、氯酸盐及溴酸盐的同时测定。     

离子色谱-质谱联用同时测定海产加工品中亚氯酸盐、氯酸盐、高氯酸盐和溴酸盐

建立了离子色谱-质谱联用技术同时测定海产加工品中亚氯酸盐、氯酸盐、高氯酸盐和溴酸盐的分析方法。选用高容量、亲水性的Ion Pac AS16(250 mm×2 mm)阴离子交换柱为分析柱,以EGC(自动淋洗液发生器)在线产生KOH为淋洗液,采用外接水模式,串联质谱进行检测。质谱以MRM(多元反应监测)模式分别监控以下离子对:亚氯酸盐m/z 66.9/50.8、氯酸盐m/z 84.3/68.9、高氯酸盐m/z 98.9/82.9和溴酸盐m/z 126.8/112.9,并以峰面积定量。结果表明,在一定的质量浓度范围内,4种阴离子的色谱峰面积与质量浓度呈线性相关,线性相关系数(r)均大于0.999,在1、5、10μg/L 3个加标水平下,4种目标离子的平均回收率均在89.6%~96.4%范围内,RSD(相对标准偏差)均在3.7%~5.3%之间(n=6)。该方法对亚氯酸盐、氯酸盐、高氯酸盐、溴酸盐的检出限(S/N=3)分别为0.2、0.5、0.01、0.02μg/L。上述研究表明,此方法可用于海产加工品中痕量亚氯酸盐,氯酸盐、高氯酸盐和溴酸盐的同时测定。     

冷冻诱导液液萃取-超高效液相色谱-四极杆静电场轨道阱高分辨质谱法检测液态奶中氯酸盐和高氯酸盐

目的 建立液相色谱高分辨质谱法快速检测液态奶中的氯酸盐、高氯酸盐的分析方法。方法 样品经乙腈提取后,-20℃冷冻30 min,取上清液直接上机测定。在流速0.5 mL/min下,以乙腈-0.1%氨水溶液作为流动相,梯度分离。采用平行反应监测模式扫描,同位素内标法进行定量。结果 氯酸盐、高氯酸盐分别在0.4-200 ng/mL、0.2-100 ng/mL范围内线性关系良好,相关系数均大于0.995。方法检出限分别为氯酸盐0.20 μg/kg,高氯酸盐0.11 μg/kg。样品加标回收率为86.8%~105.4%,日内精密度为4.2%~9.6%,日间精密度为3.5%~9.8%。应用建立的方法对185份液态奶进行测定,氯酸盐检出率为7.0%,浓度为2.12-8.14 μg/kg,高氯酸盐检出率为82.2%,浓度为1.28-11.25 μg/kg。检测结果与采用2020年国家食品污染物和有害因素风险监测工作手册食品中氯酸盐和高氯酸盐检测方法检测结果一致。结论 该方法操作简便、检出限低、准确性高,适用于液态奶中氯酸盐、高氯酸盐的定性和定量分析。     

高效液相色谱-串联质谱法测定肉类中的氯酸盐和高氯酸盐

建立了高效液相色谱-串联质谱法同时测定肉类中氯酸盐和高氯酸盐的分析方法。样品经乙腈-水（13:7,V:V）提取后离心,上清液经PRiME HLB固相萃取柱净化,Acclaim Trinity P1复合离子交换柱分离,以乙腈及20 mmol/L乙酸铵为流动相进行梯度洗脱,串联质谱分析中采用电喷雾正离子源和多反应监测模式,内标法定量。结果表明,氯酸盐和高氯酸盐分别在2～200.0 ng/mL、1～100.0 ng/mL范围内呈现良好线性关系,决定系数分别为0.9983和0.9998,方法的定量限分别为2.0、1.0μg/kg。氯酸盐和高氯酸盐分别在三种肉类四个添加水平6.0、20、40、200μg/kg和3.0、10、20、100μg/kg的加标回收率为91.0%～105.7%和94.2%～110.5%,相对标准偏差为1.8%～9.7%和0.7%～9.4%。本方法具有操作简单、灵敏度高、稳定性好等优点,可很好地满足肉中氯酸盐、高氯酸盐的检测。     

离子色谱法同时测定饮用水中的溴酸盐和高氯酸盐

建立离子色谱同时测定饮用水中溴酸盐和高氯酸盐的方法。通过加热浓缩对水样中的Br O3-和Cl O4-进行富集,选用亲水性AS19分析柱作为分离柱、氢氧化钾溶液为淋洗液,优化离子色谱测试条件后,采用电导检测器测定水中溴酸盐和高氯酸盐的含量。结果表明,当进样体积为100μL时, Br O3-和Cl O4-浓度分别在5～125μg/L、0.02～1.25 mg/L范围内与其对应的峰面积呈线性关系,线性回归方程分别为y=0.000 21C-0.000 23、y=0.302 98C-0.005 27,相关系数分别为0.999 8和0.999 9,方法检出限分别为0.50μg/L和5.2μg/L。对每份样品进行3个水平的加标回收试验,加标回收率均在90.33%～103.79%之间,测定结果的相对标准偏差在0.34%～4.46%之间,并与液相色谱-质谱/质谱法的测定结果进行比较,结果无显著性差异。方法具有准确度高、选择性好和操作简单等优点,可应用于多种饮用水中溴酸盐和高氯酸盐含量的同时测定。     

超高效液相色谱-串联质谱法测定生活饮用水中氯酸盐和高氯酸盐

目的 建立超高效液相色谱-串联质谱（UPLC-MS/MS）法同时测定生活饮用水中的氯酸盐和高氯酸盐的含量。方法 采用Anionic Polar Pesticide色谱柱（2.1 mm×150 mm,5 μm）为分析柱对高氯酸盐、氯酸盐进行分离,选用50 mmol/L甲酸铵甲酸水溶液（含0.9%甲酸）和乙腈作为流动相进行梯度洗脱。在电喷雾离子源,负离子多反应监测模式下测定,通过内标法进行定量。结果 氯酸盐和高氯酸盐在0.5～80 μg/L范围内线性关系良好,相关系数R2不低于0.999,氯酸盐和高氯酸盐的检出限、定量限均分别为0.5 μg/L和1.0 μg/L。氯酸盐和高氯酸盐均在1.0、2.0、20.0、80 μg/L 4个水平下回收率为83.98%～106.80%,相对标准偏差为0.57%～3.50% (n=6);结论 该方法简便、快捷、准确,适用于快速检测生活饮用水中的氯酸盐和高氯酸盐。     

离子色谱-串联质谱法测定生活饮用水中的高氯酸盐、氯酸盐和溴酸盐

目的建立离子色谱-串联质谱法同时测定生活饮用水中高氯酸盐、氯酸盐和溴酸盐含量的分析方法。方法选用高容量、亲水性IonPacAS-20阴离子交换柱为分析柱对高氯酸盐、氯酸盐和溴酸盐进行分离,以淋洗液自动发生器在线产生KOH为淋洗液进行洗脱。采用外接水模式,串联质谱进行检测。采用电喷雾离子源负离子模式和多反应监测测定,外标法定量。结果高氯酸盐、氯酸盐和溴酸盐的线性范围分别为0.04～20.00μg/L, 0.02～10.00μg/L, 0.04～20.00μg/L,相关系数r~20.999,检出限分别为0.02、0.01和0.02μg/L,定量限分别为0.04、0.02和0.04μg/L,加标回收率在90.0%～98.8%,相对标准偏差(relative standard deviation,RSD)小于8.0%。结论该方法简便、可靠、稳定、灵敏度高,可用于生活饮用水中高氯酸盐、氯酸盐和溴酸盐含量的快速测定与确认。     

离子色谱法测定饮用水中溴酸盐的方法改进

正本文改进了离子色谱法测定饮用水中溴酸盐的方法。以4.5 mmol/L Na_2CO_3和0.8 mmol/L NaHCO_3混合液作为淋洗液,流速1.0mL/min,一次进样500μL为色谱条件。结果表明:相关系数为0.999 5,检出限为3.2μg/L,加标回收率93.25%~103.75%,相对标准偏差为1.0%~3.4%。     

高效液相色谱-串联质谱法测定大米中高氯酸盐含量

目的建立高效液相色谱-串联质谱法测定大米中高氯酸盐的含量。方法样品提取液经过固相萃取柱快速净化处理后去除基质干扰物,采用Thermo Acclaim TRINITY P1色谱柱分离,以乙腈-20 mmol/L甲酸铵为流动相进行梯度洗脱,流速为0.3mL/min,柱温30℃,外标法定量检测。结果在高氯酸盐浓度为1.0～100.0 ng/mL的范围内的线性相关系数较好(r=0.999),检出限为4.0μg/kg,定量限为10.0μg/kg,高、中、低3个浓度水平的加标回收率在82.3%～93.2%之间,测定值的相对标准偏差小于5%(n=6)。结论该方法简便快捷、灵敏可靠,适用于大米中高氯酸盐的快速检测。     

Specific determination of bromate in bread by ion chromatography with ICP-MS

A sensitive method for detecting bromate in bread by ion chromatography with inductively-coupled plasma mass spectrometry (IC/ICP-MS) was developed. Bromate was extracted from bread with water. The clean-up procedure included a 0.2 micron filter, a C18 cartridge for defatting, a silver cartridge to remove halogen anions, a centrifugal ultrafiltration unit to remove proteins, and a cation-exchange cartridge to remove silver ions. A 500 microL sample solution was applied to IC/ICP-MS. The detection limit and the quantitation limit of bromate in the solution were 0.3 ng/mL and 1.0 ng/mL, expressed as HBrO3, respectively, which corresponded to 2 ng/g and 5 ng/g, respectively, in bread. Recovery of bromate was about 90%, and the CV was about 2%. Based on the detection limit in solution and recovery from bread, the detection limit of bromate in bread was estimated to be 2 ng/g.     

基于婴幼儿奶嘴安全性的12种N-亚硝基胺及其迁移量测定方法研究 ——HPLC-MS/MS法

采用高效液相色谱-质谱法测定奶嘴中12种N-亚硝胺的含量.奶嘴用模拟唾液浸泡,以Eclipse Plus C18色谱柱为分离柱,以甲醇-0.1％甲酸水溶液为流动相进行梯度洗脱,采用电喷雾正模式(ESI+)电离和多反应监测(MRM)模式监测.12种N-亚硝胺浓度在1～20 ng/mL范围内线性关系良好,相关系数均大于0....     

免疫亲和柱净化-高效液相色谱法检测两种饮料中双酚A含量

建立了免疫亲和柱净化-高效液相色谱荧光检测法(IAC-HPLC-FL)检测豆奶及橙汁饮料中的双酚A含量。采用甲醇提取、离心、磷酸缓冲溶液稀释后,经免疫亲和柱纯化,用1 mL甲醇-水(80:20,体积/体积)洗脱,应用高效液相色谱法检测。以C₁₈柱为分离色谱柱,甲醇-水(60:40,v/v)溶液为流动相洗脱,流速0.4 mL/min,柱温30℃,进样量10 μL,荧光检测器检测,激发波长228 nm,发射波长310 nm。结果表明:在1.0~300.0 ng/mL的浓度范围内,双酚A的浓度与峰面积呈良好的线性关系(相关系数R2=0.9998),检出限定为1 ng/mL。平均回收率为82.5%~104.6%,相对标准差为2.3%~6.4%。分别选取玻璃瓶装和塑料瓶装的豆奶和橙汁饮料进行双酚A含量检测,玻璃瓶装的豆奶和橙汁饮料中双酚A含量均小于检出限1 ng/mL,而某款塑料瓶装的豆奶和橙汁饮料检测出极其微量的双酚A,其双酚A含量分别为1.44、1.57 ng/mL,处于可接受水平。该方法简单快速、灵敏度高、重复性好,能够有效地分离和检测饮料中的双酚A,适用于豆奶和橙汁等饮料中的双酚A的测定。     

糙米中砷形态检测方法的对比研究

目的比较液相色谱-原子荧光光谱法(highperformance liquid chromatography atomic fluorescence spectrometry,HPLC-AFS)和液相色谱-电感耦合等离子体质谱法(high performance liquid chromatography inductively coupled plasma mass spectrometry, HPLC-ICP-MS)两种方法对糙米中砷形态的测定。方法糙米样品经0.15 mol/L硝酸溶液提取,分别采用HPLC-AFS联用仪,流动相为15 mmol/L的磷酸二氢氨缓冲溶液(pH=6.0),经CNWSep AX阴离子交换色谱柱分离检测;同时,采用HPLC-ICP-MS联用仪,流动相为含5 mmol/L己烷磺酸钠、20 mmol/L柠檬酸的缓冲溶液(pH=4.3),经安捷伦ZorbaxSB-Aq反相色谱柱分离检测。结果两种方法检测4种砷形态在5.0～100.0 ng/mL范围内线性良好,相关系数均在0.999以上; HPLC-AFS法的检出限分别为2.3、0.6、1.0和1.1 ng/mL,加标回收率在85.1%～106%之间,相对标准偏差(relative standard deviation, RSD)均小于5%; HPLC-ICP-MS法的检出限分别为0.1、0.1、0.1和0.2 ng/mL,加标回收率在82.8%～106%之间,相对标准偏差(RSD)均小于5%。结论两种方法都可以满足糙米中4种砷形态的检测,在实际情况中可根据需要选择相应的检测方法。     

Trace analysis of bromate, chlorate, iodate, and perchlorate in natural and bottled waters

A simple and rapid method has been developed to simultaneously measure sub-microg/L quantities of the oxyhalide anions bromate, chlorate, iodate, and perchlorate in water samples. Water samples (10 mL) are passed through barium and hydronium cartridges to remove sulfate and carbonate, respectively. The method utilizes the direct injection of 10 microL volumes of water samples into a liquid chromatography-tandem triple-quadrupole mass spectrometry (LC-MS/MS) system. Ionization is accomplished using electrospray ionization in negative mode. The method detection limits were 0.021 microg/L for perchlorate, 0.045 microg/L for bromate, 0.070 microg/L for iodate, and 0.045 microg/L for chlorate anions in water. The LC-MS/MS method described here was compared to established EPA methods 300.1 and 317.1 for bromate analysis and EPA method 314.0 for perchlorate analysis. Samples collected from sites with known contamination were split and sent to certified laboratories utilizing EPA methods for bromate and perchlorate analysis. At concentrations above the reporting limits for EPA methods, the method described here was always within 20% of the established methods, and generally within 10%. Twenty-one commercially available bottled waters were analyzed for oxyhalides. The majority of bottled waters contained detectable levels of oxyhalides, with perchlorate < or = 0.74 microg/L, bromate < or = 76 microg/L, iodate < or = 25 microg/ L, and chlorate < or = 5.8 microg/L. Perchlorate, iodate, and chlorate were detectable in nearly all natural waters tested, while bromate was only detected in treated waters. Perchlorate was found in several rivers and reservoirs where itwas not found previously using EPA 314.0 (reporting limit of 4 microg/L). This method was also applied to common detergents used for cleaning laboratory glassware and equipmentto evaluate the potential for sample contamination. Only chlorate appeared as a major oxyhalide in the detergents evaluated, with concentrations up to 517 microg/g. Drinking water treatment plants were also evaluated using this method. Significant formations of chlorate and bromate are demonstrated from hypochlorite generation and ozonation. From the limited data set provided here, it appears that perchlorate is a ubiquitous contaminant of natural waters at trace levels.     

高效液相色谱-串联质谱法测定茄科蔬菜及其制品中α-茄碱和α-卡茄碱的含量

目的建立通过式固相萃取-高效液相色谱-串联质谱法同时测定茄科蔬菜及其制品中α-茄碱和α-卡茄碱含量的分析方法。方法样品采用1%甲酸水溶液:乙腈=1:1 (V:V)涡旋提取, Oasis? PRiME HLB固相萃取(solid phase extraction, SPE)柱净化,经过色谱柱BEH Amide (2.1 mm×100 mm, 1.7μm)分离,以2 mmol/L乙酸铵的0.1%甲酸水溶液(A):2mmol/L乙酸铵的乙腈溶液(B)为流动相进行梯度洗脱,柱温40℃,流速0.4 mL/min,多反应模式监测,基质匹配标准曲线外标法定量。结果在1~500 ng/mL范围内,α-茄碱和α-卡茄碱与峰面积线性关系良好(相关系数r2>0.998)。在低、中、高3个水平添加下,α-茄碱回收率为91.3%~104.6%,α-卡茄碱回收率为90.3%~108.4%,相对标准偏差不超过5.5%(n=6)。结论该方法快速简便、准确度好、灵敏度高,适用于大批量茄科蔬菜及其制品中α-茄碱和α-卡茄碱的快速测定。     

HPLC梯度洗脱法测定兰索拉唑含量和有关物质

目的建立检测兰索拉唑含量及有关物质的方法。方法采用C18柱(250 mm×4.6 mm,5μm);流动相A为水,流动相B为乙腈-水-三乙胺(160:40:1),用磷酸调节pH 7.0;梯度洗脱:0 min-40 min-50 min-51 min,流动相A:B的比例为90:10-20:80-20:80-90:10;检测波长285nm。结果兰索拉唑与各已知杂质及降解产物均良好分离,兰索拉唑在44.7～447μg/mL浓度范围内与峰面积呈良好的线性关系,最低检测限与最低定量限分别为2.3 ng与6.4 ng。结论本方法检测兰索拉唑有关物质专属性强,检测含量精密度高。     

Determination of tetrodotoxin in puffer-fish tissues, and in serum and urine of intoxicated humans by liquid chromatography with tandem mass spectrometry

A simple and rapid method was developed for the analysis of tetrodotoxin in puffer-fish tissues, and in serum and urine of humans poisoned after consuming puffer-fish, by means of high-performance liquid chromatography with tandem mass spectrometry (LC/MS/MS). Tetrodotoxin was extracted with 2% acetic acid. The extracted solution from puffer-fish tissues was diluted with water, and the extracted solution from human serum and urine was cleaned up by LC/MS/MS with a methacrylate-styrenedivinylbenzene cartridge. The LC separation was performed on a C18 column (50 mm x 2.1 mm i.d.) using 10 mmol/L IPCC-MS7-methanol (65 : 35) as the mobile phase at a flow rate of 0.2 mL/min. The mass spectral acquisition was done in the positive ion mode by applying selected reaction monitoring (SRM). The recoveries of tetrodotoxin were 79-90% from puffer-fish tissues fortified at 0.1 microg/g and 1 microg/g, and 93-101% from human serum and urine fortified at 0.5 ng/mL and 5 ng/mL. The detection limits of tetrodotoxin were 0.01 microg/g in puffer-fish tissues and 0.1 ng/mL in human serum and urine. Thirty samples of puffer-fish from wholesale markets, and 7 serum and 5 urine samples of humans poisoned after consuming puffer-fish were analyzed by this method. Tetrodotoxin was detected in all puffer-fish tissues, and all serum and urine samples at the levels of 0.04-140 microg/g, 0.9-1.8 ng/mL and 15-150 ng/mL, respectively.     

微萃取瓶富集-液相色谱法测定苹果醋中氨基甲酸酯类农药

采用自制微萃取瓶富集—高效液相色谱法测定苹果醋中氨基甲酸酯类农药。异辛烷作萃取剂,反相C18色谱柱,V(甲醇)∶V(乙腈)∶V(水)=40∶17∶43做为流动相,流速1.0 mL/min,210 nm紫外检测。采用基质校正工作曲线,西维因、抗蚜威、叶蝉散和仲丁威在16～1 000 ng/mL内线性良好。平均回收率分别为86.33%、101.22%、100.17%和112.32%,相对标准偏差小于5.26%。