Transfer assessment of carbendazim residues from rapeseed to oil production determined by HPLC–MS/MS

Abstract

It is crucial to develop practical procedures for the control and reduction of pesticide residues in oil productions from farm to dining table. In this study, the dissipation behaviors of typical fungicide from rapeseed to oil production were studied to reveal relationship among spraying stage, application dosage, household oil processing stage, and pesticide residues. In the field trials, rape plants were sprayed with carbendazim at three different dosages during flowering period. Transfer assessment of carbendazim residues from rapeseed to oil production during household oil processing via different press techniques was determined using high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC–MS/MS). The recoveries of carbendazim in rapeseed samples, meals after squeezing samples, and rapeseed oil samples ranged from 82.5% to 93.6% with relative standard deviations (RSDs) ＜5.2%. The validation results illustrated that the methods were reliable and sensitive. The average processing factor (PF) during household oil processing via hot press technique and cold press technique was 0.15 and 0.51, respectively. This study demonstrated that household oil processing could significantly reduce the pesticide residues, especially by hot press technique.     

Electrical properties of plant root cell plasma membrane influence the alleviation of Al and Cu phytotoxicity by Ca and Mg cations

Environmental Science and Pollution Research - Although it is known that cations such as calcium (Ca) and magnesium (Mg) can alleviate metal toxicity in plants, much uncertainty remains regarding...     

Highly efficient thermo-photocatalytic degradation of tetracycline catalyzed by tungsten disulfide under visible light

Environmental Chemistry Letters - Antibiotics are water and soil contaminants causing the development of multi-resistant bacteria, calling for advanced water treatments. For instance,...     

Characterizing interactions of socioeconomic development and environmental impact at a watershed scale

Environmental Science and Pollution Research - Worldwide socioeconomic development has resulted in huge irretrievable environmental problems in various ecosystems. This study employed seven coastal...     

Low ambient temperature increases hospital re-admissions for systemic lupus erythematosus in humid subtropical region: a time series study

Currently, the correlation between ambient temperature and systemic lupus erythematosus (SLE) hospital admissions remains not determined. The aim of this study was to explore the correlation between ambient temperature and SLE hospital admissions in Hefei City, China. An ecological study design was adopted. Daily data on SLE hospital admissions in Hefei City, from January 1, 2007, to December 31, 2017, were obtained from the two largest tertiary hospitals in Hefei, and the daily meteorological data at the same period were retrieved from China Meteorological Data Network. The generalized additive model (GAM) combined with distributed lag nonlinear model (DLNM) with Poisson link was applied to evaluate the influence of ambient temperature on SLE hospital admissions after controlling for potential confounding factors, including seasonality, relative humidity, day of week, and long-term trend. There were 1658 SLE hospital admissions from 2007 to 2017, including 370 first admissions and 1192 re-admissions (there were 96 admissions with admission status not stated). No correlation was observed between ambient temperature and SLE first admissions, but a correlation was found between low ambient temperature and SLE re-admissions (RR: 2.53, 95% CI: 1.11, 5.77) (3.5 °C vs 21 °C). The effect of ambient temperature on SLE re-admissions remained for 2 weeks but disappeared in 3 weeks. Exposure to low ambient temperature may increase hospital re-admissions for SLE, and thus it is important for SLE patients to maintain a warm living environment and avoid exposure to lower ambient temperature.

     

安全工程学科建设与专业建设

分析了目前我国安全工程学科建设和专业建设中存在的问题，提出了我国安全工程学科建设和专业建设的一些设想和看法。     

中国煤矿火灾的防治

分析了中国煤矿历年火灾与安全技术工程的关系,火灾类别、发火部位、与频率的统计;介绍了煤矿内外因火灾防治方法的沿革与发展,包括注浆、阻化剂、均压防灭火,注氮情化防火,高泡、燃油惰气灭火等的实例与成效。     

农药的环境问题及发展动向

本文综述了农药对环境的污染,以及昆虫对农药产生的抗性。报道了农药最近的研究动向。     

Role of interaction between selenium and organic matters on causes of Kaschin-Beck disease

Influences of organic matters of soil and water on speciation and biological utilization of selenium are discussed. Humic acid is found to be the main pool of selenium in soil and affects the bio-availability of the element in soil-plant system. Fulvic acid from drinking water inhibits the absorption of selenium taken from diet. The relationship between high content of organic matters of water and selenium deficiency on the causes of KBD could be reflected in the limited synthesis of glutathione peroxidase, which is generally stimulated by fulvic acid from drinking water.     

用二阶闭合理论确定的大气扩散系数的分析

本文分析了作者以前得到的一种扩散系数的某些结果,认为这种扩散系数解释了垂直湍流和风切变的联合作用使水平扩散增大的实验观测结果;建立了与雷诺应力间的函数关系,在简化情况下,与泰勒理论得到的结论类似。在边界层低层,湍流扩散系数与粘性系数是不相等的,有时会有较大差别。