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研究了干度系数法和快速测定浆料浓度法对打浆度测定的影响,测定了两种制浆方式的低浓浆料纤维分布,分析了两种方法测定的打浆度与片基再造烟叶物理指标的相关性。结果表明:(1)浆料浓度法测定周期短,能及时表征浆料质量,较好指导生产;(2)浆料浓度法测定两种制浆方式浆料浓度均比干度系数法高0.3-0.5百分点;浆料浓度法测定打浆度均比干度系数法的高,其中制浆方式1高(3.3~4.3)°SR,制浆方式2高(6.3~8.3)SR;(3)浆料浓度法测定打浆度更能真实反映浆料纤维的变化;(4)浆料浓度法测定的打浆度更能准确地表征浆料质量。 相似文献
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滑石粉在加入浆料中以前,必须进行溶解和过滤,为控制与浆料配比的准确性,就必须保持滑石粉的固定浓度。 过去在测定滑石粉浓度时,均采用过滤、烘干、称量法,这样的方法需要4小时以上的时间才能测定出被使用的滑石粉浓度,其对生产来说已经失去指导作用。然而滑石粉配比量均多少,又直接的影响到产品质量的优势,为了解决在生产中存在的这一矛盾,试推导出以下滑石粉浓度快速测定法,供有关方面的同志参考。 相似文献
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浆料的稳定性影响成纸质量,传统的肖氏打浆度仪可快速测定打浆度和湿重。但是不能全面反映浆料的特性,尤其对高浆度浆测定不敏感。纤维分析仪不仅可以更全面反映成浆质量,而且与肖氏打浆度仪测得的数据有良好的对应关系,纤维分析仪可作为浆料分析除快速测定打浆度的肖氏打浆度仪以外分析成浆质量的更精准的分析工具。 相似文献
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还原染料轧染保险粉含量的快速测定 总被引:1,自引:1,他引:1
介绍一种快速精确的测定还原染料轧染汽蒸液中保险粉浓度的方法,即铁氢化钾滴定法。该方法与常规的直接碘法滴定法相比,具有操作简单、快速和成本低的特点。 相似文献
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《棉纺织技术》2020,(8)
研究长丝聚酯浆料和短纤聚酯浆料的溶解性和水解性。通过将长丝聚酯浆料及其浆膜、短纤聚酯浆料及其浆膜分别放入去离子水、氯化钠溶液和碱液中,测定其溶解性和水解性。结果表明:在去离子水中,两种聚酯浆料及其浆膜的溶解时间随温度的升高而缩短;硫酸镁浓度不小于360 mg/L时,两种聚酯浆料及其浆膜的溶解时间大于60 min,加入六偏磷酸钠可以缩短其在硬水中的溶解时间;当碱液浓度小于5.0 g/L时,在相同浓度下,两种聚酯浆料及其浆膜在碳酸钠中的溶解时间小于在氢氧化钠中的溶解时间;在1227-十二烷基二甲基苄基氯化铵浓度为1 g/L~2 g/L、氢氧化钠浓度不小于30.0 g/L时,两种聚酯浆料及其浆膜在50 min内可以完全水解。认为:通过在长丝聚酯浆料和短纤聚酯浆料中加入相应溶剂能够提高浆料的溶解性和水解性。 相似文献
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N. MOONSAMY F. MOCHABA M. MAJARA E. S. C. O'CONNOR-COX B. C. AXCELL 《Journal of the Institute of Brewing》1995,101(3):203-206
The rapid measurement of yeast trehalose by Near Infra-Red Reflectance (NIR) spectrometry is demonstrated for both dried and slurry samples. The reproducibility of the method was acceptable considering the errors in both the enzymatic calibration and determination of cell dry weight methods. The results were better in the case of slurry samples presumably because the error in the drying method was removed. Direct slurry measurement is also more rapid and more desirable for future inline applications. Further improvements in the measurement of yeast glycogen by NIR as previously published are also reported. NIR reflectance would appear to be a promising technique for the rapid in-line measurement of yeast intracellular components within a brewery. 相似文献
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运用电荷检测的方法研究了浆浓、亚麻浆配比、填料添加量、硫酸铝用量以及阳离子瓜尔胶用量对再造烟叶浆料体系的湿部电荷特性的影响。结果表明:1%浆浓的再造烟叶浆料体系的阳离子需求量、Zeta电位和电导率分别为:0.1534mmol/L、-8.5mV、0.267mS/cm。浆料体系的阳离子需求量随浆浓的增大而增加,随亚麻浆配比的增加而减少;由于再造烟叶浆料体系呈碱性,硫酸铝对其湿部电荷特性的影响有限;而阳离子瓜尔胶能够显著降低再造烟叶浆料体系的阳离子需求量,瓜尔胶用量为0.4%时,能使浆料体系的阳离子需求量降低42.5%。 相似文献
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A slurry sampling technique has been utilised for elemental analysis of multivitamins preparations using inductively coupled plasma-emission spectrometry (ICP-OES). For results comparison, samples were mineralised. Slurry concentration 0.1–0.2% m/v in 6% v/v HNO3, was used. The calibration by water standard solutions, slurry standards and standard additions were tested for determination above-mentioned elements in slurries. The method offers good precision for macro elements (RSD ranged from 5% to 10%). For in-home control sample, the measured concentrations are in satisfactory agreement with independent laboratories. For the analysed multivitamin preparations, the found element concentration is compared to amount declared by producer. The concentrations of Ca, Mg, P, K, Fe, Mn, Zn, Cu and Cr, Ni, V were determined in the range 1000–100,000 and 5–50 μg g−1, respectively. The slurry ICP-OES analysis was found to be suitable for quality control monitoring of multivitamin preparations and could be useful as a routine procedure. 相似文献
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优化生产巧克力豆腐干的生产工艺,采用传统制作豆腐干的生产工艺流程:点浆→胀浆→上板→压榨→切块→成品,并在生产流程点浆中加入巧克力粉,利用控制单一变量的实验方法,控制豆腐脑的加入量为65g(一般豆腐干所需要的豆腐脑的含量),分别加入5、10、15、20、25g的巧克力粉,确定不同质量巧克力粉下豆腐干相关指标(表皮光洁度、味浓度、入口的软糯程度豆腐干的规整度),进行感官评价,确定最适合的巧克力粉加入量。豆腐干成型后的相关指标为:豆腐干的表面光洁度采用摩擦力计进行测定,豆腐干的味浓度、入口的软糯程度、规整度采用感官评价,并对发放调查问卷的统计结果进行数学统计分析,确定最优的巧克力粉加入量为15g时可优化巧克力豆腐干的生产工艺,缩短生产时间,达到最好的生产效率。 相似文献
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A slurry sampling method for the determination of iron and zinc in baby food by flame atomic absorption spectrometry 总被引:1,自引:0,他引:1
Ozbek N Akman S 《Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment》2012,29(2):208-216
A slurry sampling method is proposed for the determination of iron and zinc in baby food by flame atomic absorption spectrometry without sample digestion prior to analysis. The effect of slurry concentration (the ratio of solid sample to total slurry volume), different acids at various concentrations as diluent and the addition of dispersant on accuracy and precision were investigated. The samples were dried at 105 °C overnight and ground using an agate mortar. To obtain quantitative recoveries, 500 mg of sample was slurried in 20 ml of 0.05% Triton X-114 containing 0.1 M HNO(3), homogenised using a high-performance overhead disperser at 15,000 rpm for 5 min and directly aspirated into the flame. The accuracy of the method was tested by determination of analytes in various certified reference materials. The limits of detection of the method (N = 10; 3σ) for iron and zinc were 5.5 and 3.4 μg g(-1), respectively, using a very dilute slurry of baby food, which gave a very low background signal. Finally, the proposed method was applied to the determination of iron and zinc in different baby food samples obtained from markets in Turkey. The range of iron and zinc content for the samples were 33-76 and 15-73 μg g(-1), respectively. 相似文献
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探索一种动物尿液样品沙丁胺醇残留的快速检测方法。分别研究提取溶剂、β-环糊精与小分子醇的协同增敏作用和pH值对检测结果的影响,对该方法的选择性、线性方程、精密度和回收率以及检出限进行考察。结果表明:最佳提取溶剂为异丁醇,β-环糊精浓度为5mmoL/L,添加4%(V/V)的乙醇之后,能够明显增加沙丁胺醇荧光强度,最佳pH9;该方法的精密度相对标准偏差、回收率以及检出限分别为0.13%、96.57%、0.8μg/L。该动物尿液中沙丁胺醇残留的荧光光度检测方法,整个过程只需10~15min,操作方便,适合于现场检测。 相似文献
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以脱脂南瓜粉为原料,70% 乙醇溶液为溶剂,微波辅助萃取样品中的胡芦巴碱,建立南瓜果肉中胡芦巴碱含量的高效液相色谱(HPLC)检测方法。实验过程中,采用的色谱柱为Agilent-ZORBX SB-C18(4.6mm × 150mm,5μm)柱,流动相为0.40mmol/L 磷酸溶液(pH3.2),流速为0.6mL/min,进样量为10μL,检测波长265nm,柱温为室温。研究结果表明,胡芦巴碱在5.6~134.4μg/mL 范围内具有良好的线性关系,相关系数r=0.9999(n=5);平均回收率为97.09%,RSD 为1.02%(n=5)。本法简便、准确、重复性好,可用于南瓜果肉中胡芦巴碱的含量测定。此外,采用此方法测定了13 个品种南瓜果肉中胡芦巴碱的含量,结果表明胡芦巴碱含量为172.5~475.5μg/g。 相似文献