盐酸副玫瑰苯胺比色法测定作业场所空气中的甲醛

作业场所空气中甲醛测定方法为变色酸比色法［１］和酚试剂比色法［２］,由于使用浓硫酸和显色液的稳定时间短等缺点,我们研制了盐酸副玫瑰苯胺比色法测定作业场所空气中的甲醛,方法步骤简单,重现性好,显色液的稳定时间较长等优点,现将结果报告如下。一、实验方法１－原理：甲醛与二氯亚硫酸汞钠及盐酸副玫瑰苯胺作用生成紫红色,比色定量。２－试剂：①吸收液：蒸馏水。②四氯汞钠溶液：溶解１３－６ｇ氯化汞及５－８ｇ氯化钠于１Ｌ容量瓶中。③二氯亚硫酸汞钠溶液：溶解０－０６ｇ无水亚硫酸钠于５０ｍｌ四氯汞钠溶液中,此液不稳定…     

盐酸副玫瑰苯胺法测定馒头中的二氧化硫

盐酸副玫瑰苯胺法测定馒头中的二氧化硫高秀英，张香馥，焦青，张红英我们用盐酸副玫瑰苯胺法对馒头中ＳＯ＿２残留量进行了测定￣［１］，并对样品处理条件及标准曲线的制作进行了探讨与改进，摸索出了适合测定馒头中的ＳＯ＿２的样品处理方法和标准曲线，结果满意。一、...     

四氯汞钾-盐酸副玫瑰苯胺分光光度法测定空气中二氧化硫的有关问题探讨

在工作场所空气中硫化物的测定方法中以四氯汞钾为吸收液,盐酸副玫瑰苯胺为显色剂测定空气中的二氧化硫是常用的方法,但在实际工作中发现了一些问题,为此进行了实验探讨,现将结果报告如下。     

盐酸副玫瑰苯胺法测定啤酒中二氧化硫的探讨

啤酒中的二氧化硫(SO_2)以气态和水合态形式存在,起抗氧化和保鲜的作用。GB2760-1996中规定啤酒中SO_2残留量不得超过0.01g/kg。GB/T5009.34-1996中盐酸副玫瑰苯胺法为测定SO_2的第一法,但此法在一些关键问题上没     

盐酸副玫瑰苯胺法测定蒜粉中的二氧化硫样品前处理方法改进

<正>蒜粉作为食品加工调料,广泛应用于食品加工过程中。蒜片是蒜粉生产的原料,其加工过程中多采用燃煤烘干脱水,造成蒜片中二氧化硫残留。食品中二氧化硫残留超过允许限值,经口摄入会引起胃肠道反应,如恶心、呕吐,还可影响钙的吸收,促进     

二氧化硫测定中盐酸副玫瑰苯胺溶液中盐酸用量的确定(摘要)

盐酸副玫瑰苯胺(可用盐酸品红代替)溶液的浓度,对测定二氧化硫的含量影响较大,特别是该溶液中盐酸用量对显色反应有很大影响,盐酸用量过多,显色减弱,盐酸用量过少,显色增强,但空白显色也增强,因此,要有足够的灵敏度,较低的空白值,故选用1mol/L盐酸溶液浓度为宜,在实际工作中盐酸用量多大为宜,可以这样来确定。     

甲醛缓冲液-盐酸副玫瑰苯胺分光光度法测定白糖中的二氧化硫

目的:建立甲醛缓冲液-盐酸副玫瑰苯胺分光光度法测定白糖中的二氧化硫的方法。方法:以甲醛缓冲液为固定剂,以盐酸副玫瑰苯胺为显色剂,在577 nm下测定吸光度。结果:二氧化硫浓度在1~10 mg/kg范围内与吸光度有很好的线性关系,回归方程为Y=0.03464+0.09238X,相关系数r=0.9997。结论:经验证,本方法可以满足白糖中二氧化硫的测定要求,且与国标方法相比,具有灵敏度高,易操作,对环境污染小等特点,是一个易于推广的方法。     

副玫瑰苯胺比色法测定食品中的二氧化硫

副玫瑰苯胺比色法是目前测定食品中二氧化硫残留量通常选用的标准方法(下简称原法).但该法用四氯汞钠吸收二氧化硫,生成的二氯亚硫酸盐[HgCl₂SO₃]络合物不稳定,易受空气氧化,在室温下每天分解1%,测定前需重新标定;同时使用汞剂量较大,不利于环境卫生及试验者身体健康.     

改良副玫瑰苯胺比色法测定食品中二氧化硫残留

亚硫酸及其盐类以及硫磺燃烧生成的二氧化硫,因其具有还原性而显示漂白、脱色、防腐、抗氧化等作用而在食品加工中广泛使用［１］,所以在食品中可能残留二氧化硫。目前检测二氧化硫的方法有盐酸副玫瑰苯胺比色法,蒸馏滴定法,离子色谱法等。其中盐酸副玫瑰苯胺比色法是目前采用的方法［２］。但是,由于该法使用的四氯汞钠吸收液是剧毒试剂,易造成对实验室内外环境的汞污染。本文提出用甲醛缓冲液代替四氯汞钠,对各种反应条件进行了研究,认为该法可靠、准确,具有较高的灵敏度。１　实验部分１１　原理　二氧化硫与甲醛作用生成羟基…     

聚乙二醇辛基苯基醚-酚试剂分光光度法测定公共场所空气中甲醛研究

目的:建立稳定、灵敏、可靠的聚乙二醇辛基苯醚(OP)-酚试剂分光光度法测定公共场所空气中甲醛的方法。方法:采用OP为稳定剂,酚试剂分光光度法测定甲醛。结果:甲醛浓度在0.002 mg/m3～0.25 mg/m3范围内呈良好的线性关系(R2)=0.9997,回收率在93.0%～100.0%,相对标准偏差≤5%(n=6),最低检出限为0.02μg。结论:采用OP-酚试剂分光光度法测定公共场所空气中甲醛,具有快速、灵敏、准确的优点,可用于公共场所空气中甲醛的测定。     

工作场所空气中二氧化硫的测定方法研究

目的:建立一种用火焰原子吸收光谱法间接测定工作场所空气中二氧化硫的新方法。方法:用(1+1000)高氯酸溶液吸收空气中二氧化硫,使其氧化成硫酸根,加铬酸钡悬浊液生成硫酸钡沉淀,释放出铬酸根,用火焰原子吸收光谱法测定铬,可间接求得二氧化硫的含量。结果:方法曲线的相关系数r=0.9993,线性范围0~5μg/ml,检出限0.12μg/ml,相对标准偏差为3.52%~4.25%,加标回收率为95.0%~106%。结论:用本方法测定工作场所空气中二氧化硫,操作手续简单、快速、检出限低、灵敏度高,结果满意。     

离子色谱法测定大气中的SO2

目的：为简便、快速地测定大气中的二氧化硫.方法：建立以内含质量体积比为0.05%的乙二胺四乙酸二钠盐（EDTA）的2.2 mmol/L的Na2CO3和2.7 mmol/L的NaHCO3混合液为吸收液采集大气中SO2,滤膜过滤后以离子色谱法直接测定大气中SO2的新型方法.结果：吸收剂中SO2在0.1～80 μg/ml的浓度范围,峰面积与浓度之间呈良好的线性关系,相关系数为0.9991,检出限为0.12 μg/10 ml,其中SO2标准溶液浓度可用离子色谱法中的面积归一法确定.结论：方法快速、灵敏、准确、选择性高、对环境无二次污染,完全满足环境监测对大气中二氧化硫的测定.     

离子色谱法测定一次性筷子中二氧化硫的含量

目的:建立一次性筷子中二氧化硫的离子色谱测定方法。方法:用0.05%甲醛热缓冲液浸泡样品,4 h后浸泡完全,用0.22μm滤膜过滤后离子色谱法直接测定SO32-。结果:浸泡液中SO32-在3 d内稳定性好,二氧化硫浓度在0~23.00 mg/L范围内方法的线性关系良好(r=0.9995),方法的检出限为0.59 mg/kg,相对标准偏差在1.33%~2.05%之间,回收率在92%~105%之间,与国标法比较两者无显著性差异。结论:离子色谱法快速、灵敏、准确、选择性高,适用于一次性筷子中二氧化硫的测定。     

Respiratory symptoms associated with sulfur dioxide exposure

Summary Exposures to sulfur dioxide (SO₂) have been associated with progressive, dose-dependent bronchoconstriction in sensitive individuals. The clinical significance of such changes remains poorly characterized. We studied subjective responses following exposure to low level concentrations of SO₂ (< 1 ppm) in a group of 10 healthy and 10 asthmatic subjects. The number and severity of complaints associated with SO₂ increased with concentrations in both healthy and asthmatic subjects. Asthmatics indicated progressive lower respiratory complaints, such as wheezing, chest tightness, dyspnea and cough with increasing levels of SO₂ while healthy subjects complained more frequently of upper airway complaints such as taste and odor with increasing levels of SO₂. Exercise increased the frequency of lower airway symptoms in asthmatics but led to no increases in symptoms in healthy subjects.From the Pulmonary Section, Yale University School of Medicine, P.O. Box 3333, 333 Cedar Street, and the John B. Pierce Foundation Laboratories, New Haven, CT 06510 (203) 785-4165Presented in part at the International Conference on Indoor Air Pollution August 10–24, 1984     

测定工作场所空气中二氧化硫的离子色谱法

目的建立在线超滤-离子色谱法测定工作场所空气中SO2。方法用装有10.0 ml浓度为5.73 g/L的过氧化氢溶液的多孔玻板吸收管采集工作场所空气中的SO2,吸收液直接通过在线超滤系统自动过滤后经Metrosep A Supp 5阴离柱分离,电导检测器检测,以SO2氧化后生成的硫酸根保留时间定性,峰面积定量。按照《职业卫生标准制定指南第4部分工作场所空气中化学物质测定方法》的要求进行试验。结果硫酸根的浓度在2～25μg/ml内线性关系良好,回归方程为Y=39.34 X-17.72,相关系数r为0.999 3。方法的检出限以硫酸根记为9.6 ng,以SO2记为6.4 ng（进样量20μl）,以采样体积为7.5 L计算该方法对空气中SO2的最低检出浓度为0.43 mg/m＾3。方法的重现性好,不同浓度的相对标准偏差为0.16%～1.87%;方法的平均采样效率为（99.24±0.21）%;穿透容量≥2.90 m;方法能准确地检测SO2标准气的浓度;样品至少在4℃可保存7d。结论该方法快速、灵敏和准确,各项指标均达到指南的要求。     

Determination of nitrogen dioxide, sulfur dioxide, ozone, and ammonia in ambient air using the passive sampling method associated with ion chromatographic and potentiometric analyses

Concentrations of nitrogen dioxide (NO₂), sulfur dioxide (SO₂), ozone (O₃), and ammonia (NH₃) were determined in the ambient air of Al-Ain city over a year using the passive sampling method associated with ion chromatographic and potentiometric detections. IVL samplers were used for collecting nitrogen and sulfur dioxides whereas Ogawa samplers were used for collecting ozone and ammonia. Five sites representing the industrial, traffic, commercial, residential, and background regions of the city were monitored in the course of this investigation. Year average concentrations of ≤59.26, 15.15, 17.03, and 11.88 μg/m³ were obtained for NO₂, SO₂, O₃, and NH₃, respectively. These values are lower than the maxima recommended for ambient air quality standards by the local environmental agency and the world health organization. Results obtained were correlated with the three meteorological parameters: humidity, wind speed, and temperature recorded during the same period of time using the paired t test, probability p values, and correlation coefficients. Humidity and wind speed showed insignificant effects on NO₂, SO₂, O₃, and NH₃ concentrations at 95% confidence level. Temperature showed insignificant effects on the concentrations of NO₂ and NH₃ while significant effects on SO₂ and O₃ were observed. Nonlinear correlations (R ² ≤ 0.722) were obtained for the changes in measured concentrations with changes in the three meteorological parameters. Passive samplers were shown to be not only precise (RSD ≤ 13.57) but also of low cost, low technical demand, and expediency in monitoring different locations.     

食品中二氧化硫残留快速检测方法的研究

[目的]研究和验证改良碘量法快速检测食品中二氧化硫残留的效果。[方法]随机采取水溶性食品94件和水不溶性食品99件,分别用改良碘量法和国标法进行检测,比较两种方法检测食品中二氧化硫的符合性。[结果]两种检测方法对水溶性食品和水不溶性食品中二氧化硫检测结果的符合率为91.0%和83.4%,与国标方法相比,差异均无显著性。[结论]改良碘量法可以作为食品中二氧化硫残留的快速筛检方法。     

工作场所和环境空气中二氧化硫甲醛-盐酸副玫瑰苯胺分光光度法比较

实验室测量审核过程中,对GBZ/T 160.33-2004《工作场所空气有毒物质测定硫化物二氧化硫的甲醛缓冲液-盐酸副玫瑰苯胺分光光度法》和HJ482-2009《环境空气二氧化硫的测定甲醛吸收-副玫瑰苯胺分光光度法》2个国标进行了比较,分析了实验中应注意的问题,并提出建议。     

Short-term association between sulfur dioxide and daily mortality: The Public Health and Air Pollution in Asia (PAPA) study

Sulfur dioxide (SO₂) has been associated with increased mortality and morbidity, but only few studies were conducted in Asian countries. Previous studies suggest that SO₂ may have adverse health effects independent of other pollutants. In the Public Health and Air Pollution in Asia (PAPA) project, the short-term associations between ambient sulfur dioxide (SO₂) and daily mortality were examined in Bangkok, Thailand, and three Chinese cities: Hong Kong, Shanghai, and Wuhan. Poisson regression models incorporating natural spline smoothing functions were used to adjust for seasonality and other time-varying covariates. Effect estimates were obtained for each city and then for the cities combined. The impact of alternative model specifications, such as lag structure of pollutants and degree of freedom (df) for time trend, on the estimated effects of SO₂ were also examined. In both individual-city and combined analysis, significant effects of SO₂ on total non-accidental and cardiopulmonary mortality were observed. An increase of 10 μg/m³ of 2-day moving average concentrations of SO₂ corresponded to 1.00% [95% confidence interval (CI), 0.75-1.24], 1.09% (95% CI, 0.71-1.47), and 1.47% (95% CI, 0.85-2.08) increase of total, cardiovascular and respiratory mortality, respectively, in the combined analysis. Sensitivity analyzes suggested that these findings were generally insensitive to alternative model specifications. After adjustment for PM₁₀ or O₃, the effect of SO₂ remained significant in three Chinese cities. However, adjustment for NO₂ diminished the associations and rendered them statistically insignificant in all four cities. In conclusion, ambient SO₂ concentration was associated with daily mortality in these four Asian cities. These associations may be attributable to SO₂ serving as a surrogate of other substances. Our findings suggest that the role of outdoor exposure to SO₂ should be investigated further in this region.