15%唑啉草酯·氯氟吡氧乙酸异辛酯可分散油悬浮剂高效液相色谱分析

采用高效液相色谱法,以乙腈和水(0.05%磷酸水溶液)为流动相,使用C_(18)反相柱和紫外可变波长检测器,在230 nm波长下对15%唑啉草酯·氯氟吡氧乙酸异辛酯可分散油悬浮剂进行分离和定量分析。结果表明,该分析方法对有效成分唑啉草酯、氯氟吡氧乙酸异辛酯的线性相关系数分别为0.999 3和0.999 5,标准偏差分别为0.12和0.17,变异系数分别为1.92%和1.83%,平均回收率分别为99.32%和99.57%。     

11.6％氯氟吡氧乙酸异辛酯·唑啉草酯乳油及安全剂解草酯分析方法研究

建立了同时检测11.6％氯氟吡氧乙酸异辛酯·唑啉草酯乳油产品中有效成分和安全剂解草酯含量的液相色谱定量分析方法.采用C18不锈钢柱和可变波长紫外检测器,以乙腈+0.1％磷酸水溶液为流动相,检测波长为230 nm同时测定产品中唑啉草酯、氯氟吡氧乙酸异辛酯和解草酯的含量.结果表明,唑啉草酯、氯氟吡氧乙酸和解草酯的质量浓度与...     

20%苯唑草酮·氯氟吡氧乙酸异辛酯可分散油悬浮剂的分析方法

采用高效液相色谱法建立了同时测定20%苯唑草酮·氯氟吡氧乙酸异辛酯可分散油悬浮剂有效成分的分析方法。使用C18反相柱和二极管阵列检测器，以甲醇+0.1%磷酸溶液为流动相进行梯度淋洗，外标法对苯唑草酮·氯氟吡氧乙酸异辛酯进行定量分析。结果表明：苯唑草酮和氯氟吡氧乙酸异辛酯的标准偏差分别为0.026 8和0.061 5，变异系数分别为0.33%和0.51%，平均回收率分别为99.65%和99.87%，线性决定系数R²分别为0.999 9和1.000 0。该方法重现性好、准确度高、线性关系良好，具有简便、快速、准确及分离效果好等优点，可用于该产品的质量控制。     

50%烟嘧磺隆·甲基磺草酮·氯氟吡氧乙酸异辛酯水分散粒剂防除夏玉米田杂草防效与安全性

[目的]为明确50%烟嘧磺隆·甲基磺草酮·氯氟吡氧乙酸异辛酯水分散粒剂对夏玉米田杂草的防效及对玉米的安全性。[方法]采用茎叶喷雾施药,定期调查的方法进行田间药效试验。[结果]50%烟嘧磺隆·甲基磺草酮·氯氟吡氧乙酸异辛酯水分散粒剂的推荐用量为97.5~195 g a.i./hm2。施药28 d后对杂草总体防效可高达98.17%。[结论]50%烟嘧磺隆·甲基磺草酮·氯氟吡氧乙酸异辛酯水分散粒剂能够有效防除玉米田杂草并对玉米具有较好的安全性。     

48%双氟磺草胺·氯氟吡氧乙酸·2甲4氯异辛酯悬浮剂对冬小麦田阔叶杂草的防除效果及安全性

[目的]通过田间药效试验明确48%双氟磺草胺·氯氟吡氧乙酸·2甲4氯异辛酯悬浮剂在冬小麦田的应用前景。[方法]于2013、2014年连续2年采用田间小区试验的方法,研究了其对小麦田主要阔叶杂草的防除效果及对小麦的安全性。[结果]48%双氟磺草胺·氯氟吡氧乙酸·2甲4氯异辛酯悬浮剂的田间推荐用量为360.00~450.00 ga.i./hm2,药后40 d鲜质量防效可达90%以上。[结论]48%双氟磺草胺·氯氟吡氧乙酸·2甲4氯异辛酯悬浮剂对小麦田主要阔叶杂草猪殃殃、荠菜、播娘蒿均有很好的防除效果,且对小麦安全,增产作用显著。     

QuEChERS-UPLC-MS/MS同时测定玉米田环境中氯氟吡氧乙酸和氯氟吡氧乙酸异辛酯的残留量

建立了使用分散固相萃取的QuEChERS结合超高效液相色谱串联质谱(UPLC-MS/MS)对玉米、鲜食玉米、秸秆以及土壤中氯氟吡氧乙酸和氯氟吡氧乙酸异辛酯进行定量测定的方法.结果表明,氯氟吡氧乙酸和氯氟吡氧乙酸异辛酯在0.005～0.5 mg/L内线性关系良好,相关系数高于0.999 8.氯氟吡氧乙酸异辛酯和氯氟吡氧乙...     

氯氟吡氧乙酸异辛酯与莠去津混配防除高梁田阔叶杂草应用技术研究

为明确氯氟吡氧乙酸异辛酯与莠去津复配对高梁田阔叶杂草的防治效果以及对高梁的安全性。采用茎叶喷雾法测定了2种除草剂室内联合作用试验,并对筛选的除草剂进行单因素随机区组田间药效试验。氯氟吡氧乙酸异辛酯与莠去津以1∶5混配对高梁田阔叶杂草的联合作用较好,30%氯氟吡氧乙酸异辛酯·莠去津悬浮剂(1∶5)推荐有效成分用量900~1080g.a.i./hm2,药后30 d对高梁田一年生阔叶杂草的总鲜重防效可达到90.2%~96.1%。氯氟吡氧乙酸异辛酯与莠去津以1∶5的比例混配能够有效防除高粱田阔叶杂草,而且对高梁安全。     

5种苗后除草剂对冷季型草坪杂草的防治效果

[目的]筛选可用于防除冷季型草坪杂草的除草剂。[方法]田间药效试验研究了5种苗后除草剂的除草效果和对草坪草的安全性。[结果]氯氨吡啶酸和双氟磺草胺·氯氟吡氧乙酸异辛酯对春季杂草防效优良;苯唑草酮和硝磺草酮对夏季杂草防效优良;5种除草剂对草坪草均安全。[结论]氯氨吡啶酸和双氟磺草胺·氯氟吡氧乙酸异辛酯适用于冷季型草坪春季杂草的防除,苯唑草酮和硝磺草酮适用于夏季杂草的防除。     

不同类型除草剂对冬小麦田阔叶杂草防效

为筛选出防效好、安全性高的冬小麦田阔叶杂草除草剂,本研究选择了不同类型的除草剂,连续2年开展了示范试验。结果表明,不同除草剂防效、除草速度、安全性存在明显差异,其中,以下6种药剂防效和安全性均较好：6%唑草酮·3%双氟磺草胺SE、333 g/L苯达松+233 g/L精2,4-滴丙酸、20%啶磺·氟氯酯WG、40%唑草酮WG、22%氟吡·双唑酮OD、40%唑草酮·双氟·2甲4氯异辛酯SC+288 g/L氯氟吡氧乙酸异辛酯EC。6%唑草酮·3%双氟磺草胺SE、40%唑草酮WG、40%唑草酮·双氟·2甲4氯异辛酯SC+288 g/L氯氟吡氧乙酸异辛酯EC的药害级别为1级,85%2甲4氯异辛酯EC+50g/L双氟磺草胺SC+30%2甲·麦草畏AS的药害级别为2～3级,其他处理均对小麦安全。该研究可为科学防控冬小麦田阔叶杂草提供数据支持。     

30%辛·烟·氯氟吡可分散油悬浮剂高效液相色谱分析

[目的]建立一种30%辛酰溴苯腈·烟嘧磺隆·氯氟吡氧乙酸异辛酯可分散油悬浮剂(OD)的定量分析方法。[方法]采用高效液相色谱法和反相色谱柱,以乙腈和水为流动相(体积比80∶20),以236 nm为检测波长,对试样中烟嘧磺隆、辛酰溴苯腈和氯氟吡氧乙酸异辛酯进行液相色谱分离测定。[结果]辛酰溴苯腈、烟嘧磺隆和氯氟吡氧乙酸异辛酯的线性相关系数分别为0.9997、0.9993、0.9996;标准偏差为0.022、0.012、0.01;变异系数为0.001%、0.002%、0.001%;平均回收率为99.50%、99.42%、99.37%。[结论]该方法具有简便、快速、分离效果好,线性关系良好、精密度和准确度高的特点,可有效用于30%辛·烟·氯氟吡OD的定量分析。     

25%吡蚜酮·SP-1可分散油悬浮剂的研制

共毒系数法确定了吡蚜酮和SP-1的最佳配比,通过试验筛选得到了25%吡蚜酮·SP-1可分散油悬浮剂的最优配方,并考察了所制制剂对水稻稻飞虱的田间药效。25%吡蚜酮·SP-1可分散油悬浮剂各项性能指标符合标准要求。田间药效试验结果显示,25%吡蚜酮·SP-1可分散油悬浮剂对稻飞虱的速效性、防效、持效性均好于对照药剂25%吡蚜酮悬浮剂。     

防治露地白菜鳞翅目害虫药剂筛选及应用技术

[目的]筛选适于防治秋白菜田鳞翅目害虫的生物杀虫剂,并建立秋白菜全生育期防治鳞翅目害虫减药增效防治技术.[方法]试验选用4种化学农药和6种生物源杀虫剂,评价不同处理在田间对3种主要鳞翅目害虫的防治效果.[结果]筛选出7种药剂,药后10 d对鳞翅目害虫平均防效为64.55％～90.54％,防效由高到低依次为2.4％甲维·...     

Deuterium Treatment and Infrared Transmission Spectra of Fused Silica

The effects of deuterium treatment on the in absorption bands infused silica were measured. The deuterium treatment progressively replaces the OH group by the OD group as determined by reduction in the intensity of OH bands. New OD bands of lower intensity were developed at longer wavelengths. The extinction coefficient of the OD group was determined to be 0.57 times lower than that of the OH group .     

Effect of oxidation debris on spectroscopic and macroscopic properties of graphene oxide

Oxidation debris (OD) and graphene oxide (GO) before and after OD removal were characterized by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, mass spectroscopy, X-ray diffraction, transmission electron microscopy and potentiometric titration, respectively. OD removal decreased GO absorption intensity in UV/Vis spectra, caused changes in peak position and absorption intensity in FTIR spectra, and resulted in the decrease of I_D/I_G in Raman spectra. OD was amorphous and had higher content of acidic groups than purified GO. OD contributed 10–25% of overall surface charge density to unpurified GO in spite of small amount (ca. 1% mass). OD removal decreased significantly GO dispersibility in aqueous solution, but increased obviously the electrical conductivity of reduced graphene oxide (rGO) and the apparent density of compacted rGO. The removal of OD was necessary because of its striking effects on both GO spectroscopic and macroscopic properties. Batch desorption in NaOH solution was recommended for OD removal from as-prepared graphite oxide because of slow OD desorption kinetics.     

Plasma-assisted surface engineering for value added in starch bioplastics: A study on enhanced surface properties and natural dye immobilization

This study examines the enhancement of starch-based bioplastic sheets for immobilizing natural dyes (ND) using plasma processes. The effects of poly(vinyl alcohol) (PVA) as a binder for ND were also assessed. Starch substrates were treated with air plasma, air plus 1,7-octadiene (OD) plasma, and air plus 2-methy-2-oxazoline (Ox) plasma before immobilizing curcumin and telang NDs, followed by an OD overcoating. Surface morphology, wettability, chemical composition, tensile strength, and surface charge were analyzed. Results showed improved wettability and dye immobilization, particularly for telang with a PVA binder and plasma treatment. OD overcoating prevented dye leaching. Air plasma reduced, while OD plasma maintained the starch's negative charge. XPS analysis indicated increased oxygen and nitrogen presence after air plasma and enhanced aliphatic carbon from OD overcoating. Tensile strength was largely unaffected, but elongation at break was reduced, especially after air and OD plasma treatment.     

42%烟嘧·莠·异丙可分散油悬浮剂防除玉米田杂草试验

为了明确42%烟嘧·莠·异丙可分散油悬浮剂对玉米田杂草的防除效果及对玉米安全性,进行了田间小区试验。结果表明:42%烟嘧·莠·异丙可分散油悬浮剂对玉米田一年生杂草有良好的防除效果。适宜施药时期为玉米3⁵叶,适宜用药量为26255叶,适宜用药量为2625³000 mL/hm2。在上述推荐剂量范围内,对玉米安全。     

Evaluation of alginate dialdehyde as a suitable crosslinker on modifying porcine acellular dermal matrix: The aggregation of collagenous fibers

Porcine acellular dermal matrix (PADM) has been investigated widely as a natural biomaterial. However, the success of PADM has been limited by insufficient stability and poor physicochemical properties. In our work, alginate dialdehyde (ADA) with various oxidation degrees (OD = 25%, 45%, and 65%) were explored to modify PADM, while glutaraldehyde (GA), dehydrathermal treatment (DHT), and carbodiimide (EDC) were used as the control. The efficacy of ADA on modifying PADM increased along with the rising of oxidation degree. The ADA (OD = 65% and 45%) groups showed better mechanical and thermal stability, crosslink density, and resistance to enzymatic degradation than ADA (OD = 25%) and DHT + EDC group. Meanwhile, the structure of PADM crosslinked by ADA (OD = 45% and 65%) were maintained largely. Further, ADA (OD = 45%) group revealed better cytocompatibility than DHT + EDC, ADA (OD = 65%) and GA group. Considering the balance of cytocompatibility and physicochemical behavior, ADA (OD = 45%) was more suitable as a natural derived crosslinker to modify PADM in tissue engineering. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43550.     

水平微肋管内流动蒸发换热特性的实验研究

为了研究微肋管结构尺寸及工况等对管内流动蒸发性能的影响,对4种微肋管和1根9.52 mm光管进行了实验,4根微肋管中管外径为9.52 mm和7 mm的各2根,所用工质为R22.实验中质量流速变化范围为90～400kg•m^-2•s^-1,所选工况为：蒸发温度7℃,入口干度15%～20%,出口过热度5～6℃.获得了蒸发换热性能随质量流速的变化,讨论了微肋结构尺寸和管径等对蒸发换热性能的影响.两根9.52mm微肋管的传热系数比光管分别分别提高了130%和180%,而其内表面积只比光管分别增加了40%和70%.     

Reuse of Sucrose Syrup in the Osmotic Dehydration of Peaches

The objective of this work was to determine the technical feasibility of reusing sucrose syrup during the osmotic dehydration of peaches combined with hot air drying (OD/HD). Two trials using different reconditioning methods were carried out over 15 OD/HD cycles, using new syrup in the first cycle and reconditioned syrup in the following ones. The first method consisted of sieving, vacuum concentration, and syrup replacement. The second included filtration through diatomaceous earth. After OD (65°Brix/50°C/4 h), the fruits were dried using a forced air dryer (65°C). The OD parameters of water loss and solids incorporation were evaluated, and physical, chemical, and microbiological analyzes were carried-out on the raw material, syrup, and products. Sensory tests were carried-out using the difference from control method. For both methods, the syrup showed increases in titratable acidity, electrical conductivity, and reducing sugar content over the cycles, but the pH decreased. The syrup turbidity increased without filtration, but for both methods the reconditioning process had no effect on the OD parameters or microbiological load. Both reuse methods favored maintenance of the yellow color of the dried peach and did not influence the flavor and sensory texture.     

螺螨酯类似物AC-101的合成与杀螨活性

为寻求高活性的杀螨剂,通过对螺螨酯进行结构改造,合成了新杀螨活性化合物3-(2,4-二氯苯基)-2-氧-1-氧杂螺[4.5]癸-3-烯-4-基-丁基-1-磺酸酯(试验代号:AC-101;暂命名:螺螨丁酯),并开发了24%悬浮剂(SC)和24%可分散油悬浮剂(OD)制剂。室内生物活性测试显示:在1 mg/L质量浓度下,螺螨丁酯对朱砂叶螨螨卵的防效达95%。田间药效试验显示:24%螺螨丁酯SC和OD药后14 d对山楂叶螨的最高防效分别为95.7%和96.2%,药后21 d对山楂叶螨的防效在73.6%以上。螺螨丁酯具有杀螨活性高、速效性好和持效期长的特点,有一定的应用开发价值。