香兰素和乙基香兰素 Pinnacle DB C18 1 香兰素 Vanillin 121-33-5 2 乙基香兰素 Ethyl vanillin 121-32-4

三聚氰胺分析 Rtx-5MS GC/MS SIM GC_FF00978 1 氰尿酸 Cyanuric acid 108-80-5 2 三聚氰胺一酰胺 Ammelide 645-93-2 3 三聚氰胺二酰胺 Ammeline 645-92-1 4 三聚氰胺 Melamine 108-78-1 5 苯代三聚氰胺 Benzoguanamine 91-76-9

1. cyanuric acid 10.258 2. ammelide 11.073 3. ammeline 11.760 4. melamine 12.328 5. benzoguanamine 14.538

石油流中的含硫化合物可以对烃加工中使用的催化剂性能和寿命产生不利影响。此外，含硫化合物的毒性和气味对环境也影响显著。 因此，从保护设备和保护环境出发，需要将硫化合物的含量降低到ppb级。

RESTEK专利钝化工艺采样瓶 天然气含硫采样时保持全成分完整，防止硫丢失技术 测定天然气的含硫量是至关重要的，因为含硫化合物可能损坏设备并减少热值。然而，由于硫会吸附在样品钢瓶里，要准确的测量其含量是有一定难度。硫钝化的采样瓶惰性明显比不锈钢钢瓶强，在收集，运输和储存中可以保证样品的完整性。

利用 Rtx®-CLPesticides和Rtx®-CLPesticides2 毛细管柱 可以较传统的方法节约一半的时间，加快分析效率 •可以对复杂的农药成分进行选择性强的全分析. •适合于QA要求的所有方法，减少重复工作

四环素族抗生素包括土霉素、四环素、金霉素和强力霉素。属快效抑菌剂，抗菌谱广，但由于细菌耐药严重而疗效差，且不良反应较多，使用已逐渐减少。 本方法可同时检测以上4种药物残留。 液相色谱仪： 戴安 P680四元梯度泵； ASI-100自动进样器； TCC-100柱温箱； 170U紫外检测器。 色谱柱：RESTEK ULTRA C18 5μm 150Х4.6mm 流动相：A：甲醇；B：10mmol/L 草酸 梯度：0-15min 82--75%B 检测波长：340nm 柱温：30°С 进样量：10µl 出峰顺序：土霉素、四环素、金霉素和强力霉素

苯甲酸、山梨酸和对羟基苯甲酸酯类是食品中常用的防腐剂。 对羟基苯甲酸酯类有：对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、对羟基苯甲酸丙酯、对羟基苯甲酸异丙酯、对羟基苯甲酸丁酯、对羟基苯甲酸异丁酯。它们对食品均有防止腐败的作用，苯甲酸的杀菌、抑菌效力随介质的酸度增高而增强，在碱性介质中则失去杀菌、抑菌效力。山梨酸是使用最多的防腐剂，也是酸性防腐剂。对羟基苯甲酸酯类以丁酯的防腐作用最好，中国主要使用乙酯和丙酯，日本使用最多的是丁酯。由于对羟基苯甲酸酯类都难溶于水，所以通常是将它们先溶于乙酸、乙醇中，然后使用，为更好发挥防腐作用，最好是将两种或两种以上的该酯类混合使用。虽然在限量范围内食用上述防腐剂对人体影响不大，但若大量摄入，则会危害人体健康。各国都对食品中可以使用的防腐剂种类和用量有严格的要求，如中国的GB2760《食品添加剂使用卫生标准》明确规定了使用范围和最大使用量。不同商品中的最大限量：苯甲酸0.2-1g/kg（中）， 山梨酸0.2-1g/kg（中），甲酯1g/kg（中），乙酯0.1-0.25g/kg（中），丙酯0.012-0.2g/kg（中），丁酯0.25g/kg（日），异丁酯0.25g/kg（日）。 本方法可同时检测食品中上述8种防腐剂。

蜂蜜中呋喃它酮、呋喃西林、呋喃妥因和呋喃唑酮代谢物残留量液相色谱-串联质谱测定方法 硝基呋喃类抗生素常用的主要包括呋喃唑酮、呋喃它酮、呋喃西林和呋喃妥因。其结构式见图1。它们做为广谱类抗生素被广泛应用于饲料添加剂和治疗药物，用于预防和治疗由沙门氏菌和埃希氏杆菌引起的猪、牛、家禽及蜜蜂的胃肠道疾病。近年来的研究表明，呋喃唑酮可能导致基因变异而具有遗传毒性，是一种诱变剂和致癌物。美国和欧盟等都将其列为禁用药物。尽管呋喃它酮、呋喃西林和呋喃妥因的药理毒性数据不如呋喃唑酮充分，但欧盟出于食品安全的考虑，在96/23/EC法规中将硝基呋喃类抗生素列为A类禁用药，决定从1997年1月1日起，禁止在动物饲料中添加任何硝基呋喃类抗生素。我国也于2002年颁布了禁止使用硝基呋喃类抗生素的禁令。目前，欧盟、美国及其他国家都对进口蜂蜜中硝基呋喃类抗生素残留做了非常严格的限制，要求4种硝基呋喃代谢物残留不得超过1μg/kg

蜂蜜中氯霉素残留量液相色谱-串联质谱测定方法 氯霉素是一种对革兰氏阴性菌和阳性菌均有很好抑制作用的抗生素，由于它稳定的药性和低廉的价格，在养蜂业用于防止蜜蜂爬蜂病，这样便导致了蜂蜜中氯霉素的残留。临床研究发现氯霉素可导致严重的甚至是致命的血液性疾病。因此，美国、加拿大及欧盟各国政府相继提出在动物源性食品（包括蜂蜜）中禁止使用氯霉素。国外对进口蜂蜜中氯霉素残留限量定在0.1μg/kg。 有关食品中（包括蜂蜜）氯霉素残留量的检测方法有酶联免疫法，放射免疫法、薄层色谱法、极谱法、HPLC法、GC法、GC-MS法和HPLC-MS法。其中放射免疫法、薄层色谱法、极谱法、HPLC法其检出限不能满足加拿大、美国、德国及欧盟0.1μg/kg的限量要求，只有LC-MS-MS法其检测灵敏度能达到0.1μg/kg，能满足世界各国对蜂蜜中氯霉素的限量要求，并且能够准确的定性和定量。本方法5g蜂蜜样品，用水溶解后，用乙酸乙酯萃取氯霉素残留，萃取液蒸干后，再用水溶解，Oasis HLB固相萃取柱净化，乙酸乙酯洗脱吸附在固相萃取柱上的氯霉素，洗脱液蒸干，用乙腈+水（20+80）定容，用Ultra C18色谱柱分离，API3000液相色谱-串联四极杆质谱定性和定量。蜂蜜中含0.1μg/kg 氯霉素选择离子图见图1。该方法选择性好，灵敏度高，准确度高，完全能满足美国、加拿大及欧盟各国对蜂蜜中氯霉素0.1μg/kg限量要求。我们采用本方法对葵花蜜、荞麦蜜、棉花蜜、油菜蜜、梧桐蜜等10个不同蜜种，在0.1μg/kg，0.3μg/kg，1.0μg/kg，5.0μg/kg 4个添加水平对氯霉素进行添加回收率实验检查方法的选择性，氯霉素的回收率在78％-111％之间，相对标准偏差在5.24-13.26%之间，并且所做空白样品实验也证明，在氯霉素出峰区域未见干扰峰，说明色谱柱的分离度是好的。

无需样品准备！消除繁杂的步骤要求的其他方法。 快速筛选大蒜特定味道和气味的化合物。 快速测定挥发物轮廓。

创新性石化解决方案 MXT®-1HT Sim Dist 色谱柱 提高效率：使用新一代 MXT®-1HT 色谱柱，可以运行更多次 1. 热稳定性高达 430℃－超低流失，最长的柱寿命。 2. 符合 ASTM D6325 和D7500 的所有技术规范。 3. 100%二甲基聚硅氧烷固定相可以实现与历史数据的快速对比。

Restek 几种常用表面处理技术 一、Siltek(硅烷化)﹠Sulfinert（硫钝化） ——钝化取样和传输系统零部件 二、Silcosteel-AC(Abate Coking) ——不粘性、防结焦、防污染、抗油污 三、Silcosteel-CR(Corrosion Resistance) ——具有抗腐蚀、抗氧化和延长材料寿命的特点 四、Silcosteel-UHV（Ultra-high vacuum） ——大大的提高了半导体﹠真空法的性能 五、Silcosteel：用于一般用途的钢和不锈钢钝化层

US EPA Method 8270D by GC/MS Rtx®-XLB Rtx®-XLB, 20m, 0.18mm ID, 0.18μm (cat.# 42802) Sample: US EPA Method 8270D mix: 8270 MegaMix™ (cat.# 31850), benzoic acid (cat.# 31415), benzidine (cat.# 31441), 2,4-dinitrophenol (cat.# 31291), Acid Surrogate Mix (4/89 SOW) (cat.# 31063), B/N Surrogate Mix (4/89 SOW) (cat.# 31062) Inj.: 0.5μL, 5ppm each analyte (2.5ng on column) (2.5ppm/1.25ng on column for 3-methylphenol and 4-methylphenol) 2mm splitless cyclo double gooseneck injector liner (cat.# 20907); splitless hold time 0.15 min.; pressure pulse: 0.20 min. @30psi GC: Agilent 6890 Inj. temp.: 270°C Carrier gas: helium Flow rate: 1.2mL/min., constant flow Oven temp.: 40°C (hold 0.5 min.) to 90°C @ 14°C/min. (no hold) to 330°C @ 22°C/min. (hold 1 min.) Det.: Agilent 5973 GC/MS Transfer line temp.: 280°C Scan range: 35–550 amu Solvent delay: 1 min. Tune: DFTPP Ionization: EI

Restek Ultra氰基柱在抗心律失常药分析应用例子 Restek Ultra氰基柱用高纯度氰基带少量硅胶位点的填料，对碱性药物的分析优于C18填料，尤其是峰形和选择性等方面。在正相法分析中，氰基填料比硅胶填料稳定，这是因为它对流动相中含有的少量水分不敏感。

请点击链接：http://www.restek.com/aoi_bio_A003.asp 高比科技 13691497252 Why lose days to downtime? Restek columns, such as the 10,000 injection Rxi®-5ms column shown here, are rugged and built for consistent long-term performance. Lipidomic studies of cholesterol synthesis, absorption, and excretion, provide information central to the investigation of cardiovascular disease and other disorders. High-throughput methods are critical to lipidomics and are used to screen thousands of samples in order to identify biomarkers and clinical diagnostics with significant predictive power. Labs can save days of downtime by using an Rxi®-5ms column in assays similar to our test method for cholesterol and low-level sterol metabolites.

请点击链接 http://www.restek.com/aoi_env_A012.asp 高比科技 13691497252 Analysis of Brominated Flame Retardants on an Rxi™-5ms Optimizing Method Conditions to Reliably Quantify BFRs By Jason Thomas, Environmental Chemist Minimal breakdown, symmetric peaks for heat-sensitive PBDEs. Complex samples well resolved, for reliable identifications. Low bleed baselines help ensure accurate quantification. Brominated flame retardants (BFRs) are widely used but potentially harmful materials currently being monitored in the environment. Analysis of higher molecular weight polybrominated diphenyl ethers (PBDEs) can present a particular problem: relatively high temperatures are required to elute them from a GC column, but they are easily debrominated at elevated temperatures. Poor peak shapes and extraneous peaks from breakdown products can complicate the analysis. Therefore, several key parameters must be optimized to ensure proper analysis of these compounds.

高比科技 13691497252 Polynuclear Aromatic Hydrocarbons US EPA Method 610 Rxi™-5ms 1. naphthalene 2. acenaphthylene 3. acenaphthene 4. fluorene 5. phenanthrene 6. anthracene 7. fluoranthene 8. pyrene 9. benzo(a)anthracene 10. chrysene 11. benzo(b)fluoranthene

高比科技 侯先生 13691497252 “Weathering” of Aroclor mixes that have been in the environment for more than 30 years and changes in Aroclor patterns in tissue samples, due to bioaccumulation have made identification and quantification of Aroclor mixes difficult. Consequently, many laboratories are analyzing long lists of PCB congeners, using the data to determine specific congener patterns, and compiling congener results to obtain an accurate total PCB concentration. Identification and quantification of PCB congeners is chromatographically challenging because there are 209 possible combinations in which chlorine atoms can be added to the biphenyl structure, ranging from addition of single chlorine (monochlorobiphenyls) to addition at every available carbon atom (decachlorobiphenyl). In 1996, George Frame published work he performed in order to determine which PCB congeners are present in Aroclor mixes. Using this work as a guide, the list of 209 possible PCB congeners can be reduced to a target list of 158 congeners. Several congeners not found in Aroclors but found in animal tissues, such as PCB#169, have been added. The list encompasses the seven European indicator compounds and the 12 most toxic congeners listed by the World Health Organization (WHO) list.

见附件 13691497252 侯先生 Decachlorobiphenyl elutes off of the “XLB” phase in 11.5 minutes, while the target compounds listed in EPA Method 8080 are 80% resolved on both columns. Optimization of the expanded list of compounds found in EPA Method 8081A resulted in 80% resolution of the 32 target compounds (plus the surrogates) on the Rtx-440, with the exception of kepone and endrin aldehyde. The Rtx-XLB phase under the same conditions has two poorly resolved pairs: endrin/2,4’-DDT & endosulfan II & kepone. The clear advantage of this column pair is the rapid analysis and low bleed without a sacrifice in resolution. These columns have the same elution order for the EPA 8080 pesticides, which is a disadvantage of this application. Although there are elution order differences for the expanded list and the retention times are different for all of the chlorinated pesticides there is still a need to find a more dissimilar stationary phase as a confirmation column

应用于分析麻醉品，重质油，烃类，农药，PCB 同类物或Aroclor®混合物,含硫化合物，胺类，溶剂杂质，模拟蒸馏，氧化 物，汽油中有机物，炼厂气。

Introduction Hybrid silphenylene backbone modied siloxane capillary GC stationary phases were commercially introduced two decades ago. These hybrid siloxanes demonstrated increased thermal stability over the conventional low polarity phases they were designed to mimic. The changes in physical properties induced by the insertion of rigid benzene ring bridges into the exible siloxane backbone also requires modications in surface chemistries to achieve good wettability and lm stability in order to maintain column eciency. Several years later, a second generation of more polar hybrid stationary phases was introduced. These polymers, designed to mimic 35% and 50% phenyl containing siloxanes, also often incorporated other types of aromatic backbone modications to further enhance thermal stability. Even more exotic surface chemistries were required to achieve wettablity while maintaining good deactivation. There are always trade-os and, in the end, deactivation often suered in the interest of column eciency. Recent application of new cross-bonding and deactivation chemistries to a 35% phenyl equivalent hybrid siloxane stationary phase has resulted in advances in both column eciency and inertness. These new columns display improved inertness for the analysis of highly polar compounds, producing symmetrical peaks for both basic and acidic compounds while maintaining high column eciencies.

RESTEK RTX-PCB • 用于GC/ECD或者 GC/MS分析PCB专用柱子，RESTEK独有. • 可以对其他半挥发性化合物进行较好分析 • 低极性;对活性化合物有惰性. • 温度稳定性320°C. 高比科技 13691497252