有关磷酸铵产品总氮含量检测方法的建议

针对复合肥料磷酸铵产品总氮含量分析方法的局限性,介绍了国标对复合肥料和复混肥料的定义,分析了采用GB/T 10209.1-2008测定复合肥料磷酸铵产品总氮含量和采用GB/T 8572-2001测定复混肥料总氮含量之间的不同之处,建议修订国标相关条款,改用GB/T 8572-2001<复混肥料中总氮含量的测定蒸馏后滴定法>测定复合肥料磷酸铵产品的总氮含量.     

复混肥料中总氮含量的检测

复混肥料中总氮含量的检测是检验复混肥质量的一个重要指标。针对GB/T 8572-2010《复混肥料中总氮含量的测定蒸馏后滴定法》中的关键步骤试样制备、样品消化、蒸馏等进行了论述,总结了注意事项,以确保检验结果的准确可靠。     

运用全自动凯式定氮仪测定复混肥料中总氮含量

参照GB/T 8572—2010复混肥料中总氮的测定蒸馏后滴定法,运用石墨消解仪进行样品消解,并利用全自动凯氏定氮仪检测肥料中的总氮含量。通过与国标法进行数据比对分析,检测结果无明显差异,且凯氏定氮仪法更加快速、简便,适用于实验室大批量样品的检测。     

未标注标识配比的复混肥料检测方法分析

GB/T15063—2009《复混肥料》规定了复混肥料中的检测方法,标GB/T8572—2010《复混肥料中总氮含量的测定蒸馏后滴定法》、GB/T8573—2017《复混肥料中有效磷含量的测定》、GB/T8574-2010《复混肥料中钾含量的测定四苯硼酸钾重量法》规定了三个主要元素的检测方法,对未标识配比的样品没有明确方法。实际工作中,从最佳滴定量、最佳沉淀量的角度对未标识样品进行初步称样量的确定,然后分析,再次准确称量样品量,最后校准的三步骤方法,达到检测的目的。     

GB/T8572-2001《复混肥料中总氮含量的测定蒸馏后滴定法》条文释义

GB／T8572—200l《复混肥料中总氮含量的测定　蒸馏后滴定法》是配合GBl5063—2001《复混肥料(复合肥料)》标准而修订的，对比原标准GB／T8572—1988的改动主要有两点。     

关于长效颗粒碳铵检测方法的讨论

以碳酸氢铵为原料制成的颗粒氮肥检测,分别采用GB3559-2001农业用碳酸氢铵和GB/T8572—2001《复混肥料中总氮含量的测定蒸馏后滴定法》两种方法进行测定,结果比较和方法讨论。     

2009年河南省农用碳酸氢铵产品质量专项监督抽查情况

本次农用碳酸氢铵产品质量专项监督抽查主要是检验产品中"氮"的实际含量,为了确保产品质量检验工作的准确性,省局先后依据GB/3595-2000<肥料中氨态含量的测定蒸馏后滴定法>和国家质检局执法督查司下发的<关于对长效颗粒碳铵产品执法检查工作的意见>(质检执函[2009]20号)规定采用GB/T8572-2001<复混肥料中总氮含量的测定蒸馏后滴定法>标准进行"氮"含量的检验.     

复混肥料中总氮含量测量结果不确定度的评定

按照2010年国标GB/T 8572《复混肥料中总氮含量的测定蒸馏后滴定法》与JJF 1059.1-2012《测量不确定度评定与表示》对复混肥料中总氮含量进行不确定度评估和分析.结果表明:本样品中总氮含量为19.50％,扩展不确定度为0.0988,相对不确定度为0.197,测定结果表示为X=(19.5042±0.20)...     

复混肥料中总氮含量测定不确定度评定（偏导数法）

1测定方法 依据GB／T8572-2001《复混肥料中总氮含量的测定蒸馏后滴定法》。将试样消化处理，各种形态的氮全部转化为铵盐，从碱性溶液中蒸馏出氨，吸收于过量硫酸溶液中，以甲基红-亚甲基蓝混合液为指示剂，用氢氧化钠标准滴定溶液返滴定，计算出总氮的百分含量。     

碳铵颗粒肥有效成分检测方法的探讨

颗粒碳酸氢铵中含有一定量的碱性物质,不能采用GB3559—2001《农业用碳酸氢铵》标准中氮含量的检测方法,采用GB／T8572—2001《复混肥料中总氮含量的测定——蒸馏后滴定法》,进行检测,取得较好效果,能满足分析检测的要求,结果准确、可靠。     

我国需增加硝基肥产量,提升硝态氮施肥比例

论述了近年国内外生产和施用的氮肥中所含铵态氮和硝态氮的比例关系。硝态氮肥产量占全球氮肥总产量:世界约14%,欧盟约40%,而我国仅占2%。消费结构比例与产量比例相近。世界最大3家氮肥生产商Yara、Terra和PCS的主要产品为硝铵尿素溶液、硝酸盐等含硝态氮产品,产量和销售量占其氮肥总量的50%以上。加快发展我国硝基肥产业,提高硝态氮肥施用量,对优化我国施肥结构、提高肥料利用率有重要意义。     

硝酸铵联产高塔造粒硝硫基复合肥装置运行总结

介绍了硝酸铵联产高塔造粒硝硫基复合肥装置的建设、试生产及技术改进等情况.该装置采用加压管式反应器中和法生产硝酸铵溶液,并选用上海化工研究院提供的工艺技术生产高塔硝硫基复合肥.2012年12月18日至23日,累计生产高塔硝硫基复合肥（15-15-15）成品4 350 t,产品的单元素含量、总养分及粒度等质量指标均满足GB 15063-2009标准的要求.     

化肥产品中氮和氯的连续分析

化肥中氮和氯的含量是经常需检测的指标，但常规分析方法为两次称量，耗时长，条件控制严格。为此将甲醛法和莫尔法相结合，建立了一种连续分析化肥产品中氮和氯的方法。分别用标准分析方法（蒸馏后滴定法和电位滴定法）做对照，对分析结果准确度进行评价。实验结果表明，该分析方法准确度高，经济，快速，分析条件易于控制，实现了铵离子的分析和掩蔽一次完成。     

复混肥中总氮含量的快速测定方法

运用棕色环法定性鉴别硝态氮,并采用半微量定氮装置对复混肥中总氮含量进行测定,具有准确度高、平行性好等优点,效率为国标检测方法的5倍,能快速准确出具结果.     

Use and efficiency of a liquid nitrogen fertilizer on grassland

Liquid nitrogen fertilizers are, per unit of N, generally cheaper than granulated ammonium nitrate because of lower production costs. Although very corrosive, the storage and handling of liquid nitrogen fertilizers does not usually present any problems. The applicability and efficiency of a commercial liquid nitrogen fertilizer (containing 39% N, half urea and half ammonium nitrate) on grassland was investigated in comparison with granulated ammonium nitrate (27% N). The liquid nitrogen fertilizer was applied on continuously grazed paddocks without any repercussions for animal health. No scorching was observed provided that certain measures were adopted while spraying the fertilizer: i.e. little dilution with water, use of low pressure and large droplets and application on dry grass in cloudy whether. In comparison with the granulated ammonium nitrate, the liquid nitrogen fertilizer was less efficient; dry matter yield and N-uptake of the grass treated with the liquid nitrogen fertilizer were 76% and 73% respectively of the dry matter yield and N-uptake of the grass treated with the granulated ammonium nitrate fertilizer.Fertilization, especially with nitrogen, represents the biggest single cost in grass production. Because liquid nitrogen fertilizers can be produced less expensively then granulated ones, their price per unit of N, delivered to the farmer, is also lower.Another advantage is that liquid fertilizers are easy to handle (despite being corrosive) and can be distributed uniformly over the field. The greatest advantage can be expected on the large grass areas of continuous grazing systems. Because of these benefits, an investigation was carried out to assess the potential use and efficiency of liquid nitrogen fetilizer in comparison with granulated ammonium nitrate nitrogen, from 1983 up to 1987. In 1983 and 1984, the grass quality, especially NH₃ and NO₃ concentration directly after spraying, and animal behaviour were assessed. From 1985 to 1987, the grass yield and nitrogen uptake were measured under mowing conditions.     

复混肥料中总氮含量检验技术及常见问题解析

通过对复混肥料中不同形态氮的化学性质的分析,解答了复混肥料总氮含量检验中的常见问题。提出了氮形态的定性鉴定法和检验关键点,旨在对复混肥的检验工作有所帮助。     

聚磷酸铵中磷含量的测定方法研究

通过对测定肥料中磷含量3种标准的不同方法的差异对比,并对含短链低聚磷酸铵的肥料样品进行实际检测,结果表明：测得的磷（以P2O5计）含量明显不同;HG／T2770--2008测得的数据高于另外2种标准,符合样品实际含量;GB／T8573--2010和NY／T1977--2010测得的数据明显低于实际含量。对于添加短链低聚磷酸铵的肥料,测定水溶肥料磷含量的方法建议按HG／T2770--2008进行,并对NY／T1977--2010标准中磷的测定方法加以修订改进,以适应国内肥料市场的进一步发展。     

添加尿素提高磷酸二铵产品中总氮含量的性行性研究

介绍磷酸二铵和尿素2种化学肥料的特性,从农作物吸收铵态氮和酰胺态氮的原理、添加尿素对磷酸二铵生产工艺的影响、选择尿素添加方式等3方面分析提高磷酸二铵产品中总氮含量的可行性,并质疑GB/T10209.1—2008总氮含量测定方法不能测出尿素所增加的氮,故建议修订相关国标。     

全自动凯式定氮仪快速测定复混肥料总氮含量

目前国家标准针对测定复混肥料总氮含量一般使用蒸馏后滴定法[1],然而蒸馏后滴定法存在操作复杂、耗时较长、试剂使用量大等缺点。文章使用Foss Kjeltec 8400全自动凯式定氮仪研究应用创新凯式定氮法快速测定未知复混肥料样品总氮含量,从加标回收率在99%～101%之间、与国标方法比对绝对相差小于0.3%、盲样多平行检测相对标准偏差小于1.5%证明此凯式定氮法能快速准确测定未知复混肥料总氮含量,具有操作简便、耗时少、重现性好、精密度高等特点,并且自动化程度高,实用性强,值得推广。     

The effects of nitrogen fertilizer form on the plant availability of phosphate from soil,phosphate rock and mono-calcium phosphate

A glasshouse trial using lettuce as the test crop, and laboratory incubations were used to evaluate the influence of various nitrogen fertilizers on the availability of phosphate from an unfertilized loamy sand soil and from the same soil fertilized with Sechura phosphate rock or monocalcium phosphate. The order in which nitrogen fertilizer form increased plant yield and P uptake from soil alone and from soil fertilized with the rock was ammonium sulphate > sulphurised urea > ammonium nitrate > urea > potassium nitrate. For each rock application (both 30 and 60 mg/pot) and for soil alone, increased P uptake by the plant correlated well with decreased soil pH. In soil fertilized with the soluble P form, monocalcium phosphate, the form of the nitrogen fertilizer had little effect on plant P uptake. Subsequent laboratory incubation studies showed that increased dissolution of soil-P or Sechura phosphate rock did not occur until acidity, generated by nitrification or sulphur oxidation of the fertilizer materials, had lowered soil pH to below 5.5. A sequential phosphate fractionation procedure was used to show that in soils treated with the acidifying nitrogen fertilizers, ammonium sulphate and urea, there was considerable release of Sechura phosphate rock P to the soil, amounting to 42% and 27% of the original rock P added, respectively.