高效液相色谱法快速测定水中的苯并(a)芘

本文建立了一种水中苯并(a)芘的快速测定方法。以环己烷萃取,过滤,浓缩,定容,用反相HPLC测定,方法的检出限为0.0025μg/L,RSD(n=8)为2.9%,加标回收率为98.9%—106.9%。     

Emission factors and thermal efficiencies of cooking biofuels from five countries

The aim of the study was to compare the environmental and thermal performance of cooking biofuels from five countries. The standard water boiling test was used to determine thermal parameters. The fuels were burnt in a metal stove in a test chamber in accordance with standard protocol. Low-flow air samplers were used for particulate matter measurements, both TSP and RSP. Later, benzo(a)pyrene was determined using the high performance liquid chromatography (HPLC) technique after extraction from particulate samples in benzene. CO was measured using an electronic datalogger and HCHO using a passive sampler. The ventilation conditions during the experiments were manipulated by using different combinations of doors, windows and fans to ensure minimum stratification of pollutants in the chamber. The indirect method of deriving emission factors was used. Levels of most of the pollutants measured was found to be higher than that reported by previous studies, especially that of benzo(a)pyrene. The thermal efficiency was found to be in the range 10-15%. The emission per task of RSP was 0.27-0.77 g and that of B(a)P in RSP was 1.87-4.17 mg.     

卷烟主流烟气中苯并[a]芘的HPLC测定

先用乙醇 +乙醚混合溶剂萃取卷烟烟气总粒相物 (TPM) ,再用中性氧化铝柱层析 ,然后 ,利用配有ODS -C18色谱柱的高效液相色谱仪 ,在以 90 %甲醇 + 10 %水为流动相 ,流速为 1mL min ,激发波长 2 86nm和发射波长 4 30nm的条件下测定了TPM中的苯并 [a]芘含量。苯并 [a]芘的回收率≥ 91.2 % ,方法的RSD <5 %。并采用该方法测定了 10种不同焦油量卷烟主流烟气中的苯并 [a]芘含量。结果表明 ,就所测定的卷烟而言 ,①在焦油量相近的情况下 ,混合型卷烟烟气中的苯并 [a]芘含量较烤烟型卷烟的低 8.2 9%～ 19.5 9% ;②无论是烤烟型还是混合型卷烟 ,随着卷烟焦油量的降低 ,虽然焦油中的苯并[a]芘总量明显降低 ,但单位量焦油中的苯并 [a]芘含量却明显增大。     

Polycyclic aromatic hydrocarbons (PAHs) survey on tea (Camellia sinensis) commercialized in Argentina

Polycyclic aromatic hydrocarbons (PAHs) occurrence in fifty-four samples of tea marketed in the main supermarkets from Argentina was described for the first time. A high performance liquid chromatography (HPLC) method was applied with fluorescence detector (FLD) and UV-VIS diodes array detector (DAD) for the analysis of sixteen PAHs in tea (camellia sinensis), with percentages recoveries higher than 84.5%. Contamination expressed as the sum of sixteen analysed PAHs was between 509.7 and 2746.5 μg kg⁻¹ on dry mass and the mean was 930.4 μg kg⁻¹ on dry mass.     

食用槟榔的加工工艺研究

通过对槟榔的传统制作工艺的研究，在保留传统工艺的基础上，应用现代科技，研究工业化生产食用槟榔的生产工艺。系统地解决了槟榔去烟垢、苯并芘及槟榔碱的控制、炮制入味等技术难题。     

食用槟榔工业化生产研究

应用现代科技，保留传统经典，工业生产食用槟榔，开创了槟榔工业科学化、现代化生产的先河。本项研究系统地解决了槟褪烟垢、去除苯并芘、槟榔碱控制、炮制入味、吹塑热封等技术，将整个生产过程连续化流水作业形成有体系的生产线，生产出有商品价值的货架产品，使产品能长期保质。成功地实现了槟榔加工规范化、产品质量安全化、产品包装高级化，销售领域商品化。     

卷烟烟气中苯并[a]芘测定方法研究

为准确测定卷烟烟气中的苯并[a]芘(BaP),建立了2种测定卷烟烟气中BaP的方法———高效液相色谱法和气质联用法。优化了2种方法的前处理过程、仪器分析条件,并测定了其重复性、回收率和检测限。通过2种分析方法的比较,确定了环己烷萃取、硅胶柱固相萃取纯化和气相色谱-质谱法定量检测BaP含量的标准分析方法。该法BaP的检测限为1.44ng/mL,回收率为99.45%～102.40%,CV为2.77%。采用该法测定了国内外81种卷烟烟气中的BaP含量,并对这些卷烟烟气中BaP含量分布进行了探讨。