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一、前言磷酸二氢钾铵是一种高效复合肥,含氧8%,五氧化二磷29~33%,氧化钾19~21%,总有效成份达60%左右,在常温下比较稳定,因而避免了施用中氮的损失。经肥效试验证明效果较好,适用于水稻、果树、花生、豆角等作物进行叶面喷施。 1980~1982年,我们用本所试制的磷酸二氢钾铵,在32个试验点对水稻进行小区及扩大试验,都获得增产,其增产率为5~8%,每亩净增稻谷30~50市斤。用肥量每亩6~8市 相似文献
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[目的]建立快速测定草铵膦原药中有效成分的核磁共振定量分析方法。[方法]以重水为溶剂、磷酸二氢钾为内标,恒温296 K,通过t1irpg脉冲序列测出磷酸二氢钾和草铵膦中31P的弛豫时间T1,作为设置脉冲延迟时间D1的实验依据;采用zgig脉冲序列测定草铵膦原药与磷酸二氢钾混合物的磷谱,以化学位移δ0.017和δ41.86的信号作为定量峰,并根据公式计算出草铵膦原药的有效成分含量。[结果]以磷酸二氢钾与草铵膦定量峰的信号强度比(I_(std)/I_x)对磷酸二氢钾与草铵膦的质量比(m_(std)/m_x)进行线性回归,线性相关系数为0.9999,同一批次原药中有效成分含量平均值为98.73%,相对标准偏差为0.18%。[结论]核磁共振磷谱定量分析方法简单、快捷,不需要待测组分标准品,可用作一些特殊样品的定性定量分析。 相似文献
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目前,国内各生产厂家的高压甲铵冷凝器衬里及列管材质为00Cr25Ni22Mo2或316L(尿素级)。在高压甲铵冷凝器内,管程的物料为尿素甲铵液,其中各组分的质量分数为尿素0.3%、C0243.4%、氨47.7%、水8.6%,其余物质可以忽略不计。正常操作时,物料的温度为166℃~170℃。其中,CO2几乎全部以甲铵的形态而存在,其摩尔百分含量为43%。管程的正常操作压力为13.5~14.5MPa。 相似文献
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离子交换法制取磷酸二氢钾雷武(河北省深州磷铵厂)磷酸二氢钾作为高效复合肥料,其特点是浓度高(含K_2O34%、P_2O_552%),用量少(每亩施0.15~0.3kg),使用方便(喷、浸、溉),适应性强(酸性、碱性土壤都适用)。此外,盐指数较低,特别... 相似文献
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室内常用装饰材料大多是由棉、木材等易燃物质制成,易引发火灾、造成人员伤亡和财产损失。因此,对室内常用装饰材料的燃烧性能进行研究是非常必要的。磷酸盐阻燃剂作为一种添加型阻燃剂,采用喷涂或浸渍等方式使棉布、木材等室内常用装饰材料获得较好的阻燃性能。本文采用磷酸氢二铵和磷酸二氢铵作为原料,分别按9:1、8:2、7:3、6:4、5:5、4:6、3:7、2:8、1:9共9种不同的质量比例混合配制磷酸盐阻燃液,并应用于棉布进行浸泡阻燃处理,然后对样品进行阻燃性能表征。实验结果表明,2:8比例的阻燃处理棉布点燃时间和达到峰值时间最长,阻燃效果最佳,目前的研究对于后续改进磷酸盐阻燃液的阻燃性能并分析影响其性能的因素具有重要意义。 相似文献
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通过酿酒酵母工程菌(Saccharomyces cerevisiae 1211)发酵制备青蒿酸,并通过单因素实验和响应面优化,考察了发酵温度、pH、半乳糖质量浓度、发酵碳源及发酵氮源等对青蒿酸发酵产量的影响。结果表明:在发酵温度30℃,发酵培养基初始pH=5.5,发酵培养基中蔗糖质量浓度91.8 g/L,半乳糖质量浓度10.1 g/L,硫酸铵质量浓度10.3 g/L,磷酸二氢钾质量浓度8.7 g/L的条件下,青蒿酸发酵产量可达(1529.7±12.6)mg/L,与未优化时的发酵产量相比,提升了67.1%。 相似文献
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Farouk T. Awadalla Fathi Habashi Michel Pag 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1990,47(2):183-186
Chrysotile asbestos (Grade 7RF66) sorbs phosphate ion from aqueous solution of phosphoric acid, basic disodium phosphate, ammonium dibasic phosphate, sodium pyrophosphate, or sodium tripolyphosphate. The amount sorbed varies from 0·2 to 2·5% P2O5. The fiber treated with ammonium dibasic phosphate has appreciably low toxicity that is comparable to chrysophosphate obtained by the reaction of chrysotile asbestos with POCl3 gas, provided the latter is washed thoroughly with water to remove watersoluble ingredients. 相似文献
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Cotton fibers were treated with an aqueous solution of ceric ammonium nitrate and examined with the electron microscope. The greatest deposition of cerium occurred in the primary wall due largely to the reaction with noncellulosic constituents in this area of the fiber. The use of ceric ions for an electron-microscopic stain was found ineffective for producing the desired contrast in the cotton fiber. 相似文献
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《合成纤维》2016,(3):1-5
用不同质量分数的N-甲基吗啉-N-氧化物(NMMO)溶液,在不同的温度和时间条件下,探究棉纤维的溶胀和溶解情况,并利用X射线衍射和红外光谱对纤维素溶胀前后的结构变化进行表征。结果表明:NMMO质量分数低于80%时,棉纤维只溶胀不溶解;在质量分数分别为83%、85%、87%的NMMO溶液中,棉纤维出现溶解现象;随着NMMO质量分数的增大、温度的升高、时间的延长,棉纤维的溶胀程度不断增加。在质量分数为83%的NMMO溶液中,棉纤维先溶胀后溶解;在质量分数为87%的NMMO溶液中,棉纤维不溶胀直接溶解;在质量分数为85%的NMMO溶液中,棉纤维的溶解存在先溶胀后溶解和直接溶解两种形式。质量分数为80%以下的NMMO水溶液处理后的棉纤维,结晶结构和化学结构均没有变化。 相似文献
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UV-radiation-induced graft-copolymerization of cotton cellulose was carried out with glycidyl methacrylate (GMA) using ceric ammonium nitrate (CAN) as a photoinitiator as well as a chemical initiator. With increase in the graft add-on, breaking load and moisture regain of cotton decreased, so also its thermal stability. The fiber surface changes due to grafting were ascertained by X-ray diffraction and scanning electron microscopy. © 1995 John Wiley & Sons, Inc. 相似文献
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The effects of additions of urea, monobasic ammonium phosphate, dibasic ammonium phosphate, sodium ammonium phosphate, ammonium nitrate, and ammonium chloride on some physical properties of an unfired and a fired illitic shale of high carbonate content were studied. X-ray examination of the Devonian shale showed that illite was the predominant clay mineral; there was also some chlorite. Scum was reduced and a clean surface was produced by additions of ½ to 1% of ammonium phosphate. Urea did not reduce scum. Ammonium nitrate and ammonium chloride increased scum. Fired absorption was increased by monobasic ammonium phosphate, ammonium chloride, and ammonium nitrate, whereas dibasic ammonium phosphate, sodium ammonium phosphate, and urea produced only slight changes. The workability of the tempered shale was decreased by 1% additions of monobasic ammonium phosphate, ammonium chloride, and ammonium nitrate. The presence of the chloride or the nitrate ions caused thixotropy and the phosphate ion caused dilatency. All ammonium additions shortened the time for complete oxidation of the shale specimens. Ammonium chloride was the best oxidation accelerator. Only the 1% addition of ammonium chloride increased the frost resistance of specimens fired to cone 07. All specimens fired to cone 02 were frost resistant and ammonium additions had no effect. The hydration of lime on specimens fired to cone 07 was not affected by additions of ammonium salts, Firing to cone 02 reacted most of the free lime and held hydration to a minimum. 相似文献
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研究了用磷酸和KCl复分解反应制备磷酸二氢钾反应速率的影响因素,考察了反应温度、压力、料液蒸发面积对提高反应速率的影响,提出了选择反应器的工艺条件。 相似文献