pH

摘要： 本文以大黄鱼卵盐溶蛋白为原料,在85°C加热20 min后于室温下放置12 h制备大黄鱼卵分离蛋白凝胶,并对其凝胶特性进行分析,同时探究了pH对大黄鱼卵分离蛋白凝胶特性的影响。结果显示,大黄鱼卵分离蛋白成胶的最低浓度为100 mg/mL,且在pH8条件下的制备的大黄鱼卵分离蛋白凝胶具有更好的流变特性。低场核磁和扫描电镜的结果表明,随着pH的增加,大黄鱼卵分离蛋白凝胶与水分子的结合增强,且凝胶的网络结构更加连续。结果表明,大黄鱼卵分离蛋白具有良好的凝胶特性,且在pH8条件下制备的大黄鱼卵分离蛋白凝胶表现更加优异。

摘要： 探究碳源等主要因素对湿地松胚性愈伤组织增殖的影响,为进一步提高其增殖效率提供技术方法和理论依据。利用优良无性系PEE3-13的胚性愈伤组织,研究不同种类及浓度的碳源、不同pH、有机氮源谷氨酰胺及其替代物丙谷二肽对其增殖的影响。结果发现培养基pH和碳源种类对其增殖的影响显著,实际pH范围为5.68~6.28时,最适宜胚性愈伤组织的生长,使用30 g·L^(-1)白砂糖作为碳源时达到最高增殖率。丙谷二肽不能替代谷氨酰胺,添加450 mg·L^(-1)谷氨酰胺时,胚性愈伤组织的增殖率最高、活力最好。当增殖培养基中使用30 g·L^(-1)白砂糖、添加450 mg·L^(-1)的谷氨酰胺,实际pH为5.68~6.28时,最适宜该无性系胚性愈伤组织的增殖,增殖率最大可达到851.27%。

摘要： 为了便捷、准确、较全面地获取马铃薯生长的土壤环境的信息,该研究采用硬件设计与软件设计相结合的方法,通过pH检测采集传感模块采集土壤酸碱度,PT100温度变送器采集土壤温度,电容式土壤湿度传感器采集土壤湿度,GPRS通信模块远程在线采集测量的数据,并对数据进行实验分析。实验结果表明:该系统电路简单,通信误码率低,性能稳定,可用于马铃薯生长环境温湿度及pH采集。

摘要： 以辽河保护区七星湿地为研究对象,通过对湿地土壤NO_(3)^(-)-N和NH_(4)^(+)-N空间分布及湿地土壤含水量与pH指标分析,研究流域湿地土壤无机氮空间变化特征。研究结果表明,湿地土壤含水量影响NO_(3)^(-)-N和NH_(4)^(+)-N的空间分布,湿地土壤含水量高,土壤中NO_(3)^(-)-N的含量相对较高;湿地土壤含水量低,土壤中NH_(4)^(+)-N的含量相对较高。湿地土壤pH值也影响NO_(3)^(-)-N和NH_(4)^(+)-N含量的空间分布,在测定的湿地土壤中,pH在5.63~7.50情况下NH_(4)^(+)-N含量较高,pH在7.50~7.63情况下NO_(3)^(-)-N含量较高。该研究结果揭示了北方河流湿地无机氮空间分布特征,可为流域湿地管理提供参考。

摘要： 以甘蔗渣为原料制备纤维素纳米晶(CNCs)用于稳定Pickering乳液,考察pH和离子强度对乳液稳定性的影响。结果表明,水解得到的CNCs,长度为120 nm左右,结晶度为70%。CNCs稳定的Pickering乳液粒径,随制备条件pH的升高而减小,在pH11的条件下,由于去质子化,使得乳液相对均一;此外,CNCs稳定的Pickering乳液粒径随着盐离子浓度的增加而增大,在100 mmol/L的浓度下,由于盐离子的静电屏蔽作用致使静电斥力减小,乳液破乳,分层更加明显。实验结果表明了甘蔗渣CNCs在作为固体粒子制备Pickering乳液中具有潜力,为甘蔗渣的利用提供新的思路。

摘要： 以金果榄组培苗为试材,研究了基础培养基类型、不同pH、不同碳源及碳源浓度、不同琼脂浓度对金果榄丛生芽继代增殖培养的影响。结果表明:金果榄丛生芽继代增殖的最优培养基为MS培养基,丛生芽增殖系数达到13.85;培养基酸碱度以pH 4.5~5.0为宜,倾向于偏酸性的环境,丛生芽增殖系数达到13.22~15.27;最佳碳源为蔗糖,浓度为25g/L;琼脂的较佳浓度为4.5~5g/L,在最优的组合条件下,金果榄丛生芽粗壮,增殖系数高,生长快。本研究结果为金果榄组培苗的继代增殖及工厂化育苗提供技术支持。

摘要： 为探讨水稻土胶体与类金属砷(As)的生物地球环境行为,本研究对比分析了微生物在初始pH=3和初始pH=7的不同酸碱条件下对土壤胶体负载As释放的作用差异,并揭示其内在机制。结果表明:在pH=3条件下微生物作用相对较弱,对胶体悬液pH与Eh影响较小,与无菌对照组相比,溶液中Fe^(2+)与As含量均有所提高,且释放的As主要为氧化态As(Ⅴ);在pH=7条件下微生物活性较强,至28 d时可使胶体悬液pH升至8.12,Eh降至-55 mV,形成强还原环境,铁还原溶解量明显增多,Fe^(2+)含量是无菌对照组的2.79倍,并且胶体中吸附态As随着Fe的还原溶解而释放,主要为还原态As(Ⅲ)。相关性分析表明,土壤胶体中As的释放与铁氧化物的还原转化有关,溶液中As释放量与Fe^(2+)含量呈显著正相关关系,尤其在中性条件下As(Ⅲ)含量与Fe^(2+)极显著正相关(r=0.798^(**),P<0.01)。研究表明,在中性环境条件下较强的微生物活性可提高土壤胶体中铁氧化物的异化还原,同时增强As的释放与转化。

摘要： 目的:探究有机酸对烟草及烟气pH的影响。方法:以34种单料烟和11种卷烟为研究对象,分别测定其非挥发性有机酸、烟草pH和卷烟主流烟气粒相物pH,采用灰色关联度分析、主成分分析对有机酸与pH进行相关性分析。结果:灰色关联度分析结果表明,草酸、软脂酸、苹果酸、油酸对单料烟烟草pH的影响程度相对较大;软脂酸、苹果酸、亚麻酸、草酸对卷烟烟草pH的影响程度相对较大;苹果酸、软脂酸、亚麻酸、草酸对卷烟主流烟气粒相物pH的影响程度相对较大。通过主成分分析,从单料烟有机酸中共提取出4个主成分,累计方差贡献率为76.66%,从卷烟有机酸中共提取出3个主成分,累计方差贡献率为78.46%。结论:苹果酸、草酸对单料烟烟草pH的影响程度较大,苹果酸、软脂酸对卷烟烟草pH、主流烟气粒相物pH的影响程度较大。

摘要： 硫酸铜是一种重要的无机化工产品,可用于食品添加剂中,以碲化铜为原料生产硫酸铜,将会极大地丰富硫酸铜的原料来源及降低生产成本。为此,本文研究了碲化铜经硫酸浸出的硫酸铜溶液中砷、铁等元素的脱除条件,制作出食品添加剂级别的硫酸铜产品。结果表明,硫酸铜溶液中加入理论量2倍的双氧水、理论量1.5倍的硫酸铁、pH=2.5时,最终结晶的硫酸铜产品Fe:1 ppm、Pb:1 ppm、As:1 ppm,杂质含量能达到国标要求。

摘要： 当前,水体中重金属污染已成为全球刻不容缓的环境问题,因此,发展去除效率高、成本低廉的新型吸附剂当前是去除重金属、完成水污染控制常用的技术。文章首先采用硅烷偶联的方法制备磁性Fe_(3)O_(4)@SiO_(2)微粒,在酸性条件下,利用环氧基硅烷(GLYMO)中的环氧基与明胶中的氨基发生开环反应,制备了Fe_(3)O_(4)@SiO_(2)@明胶吸附剂。初步探究了所制备的吸附剂去除6种常见重金属的pH吸附范围,重金属去除机制主要是明胶分子中的氨基基团与重金属发生络合作用。所制备的吸附剂具有较宽的吸附范围(5~8),能同时去除6种重金属离子,去除效率高,在重金属去除方面表现出良好的性能和潜力。

摘要： The adjustment of pH is an important way to enhance removal efficiency in coagulation units, andin this process, the floc size, strength and structure can be changed, influencing the subsequent solid/liquidseparation effect. In this study, an inorganic polymer coagulant, polyferric chloride (PFC) was used in a lowdissolved organic carbon (DOC) and high alkalinity surface water treatment. This study examined theinfluence of coagulation pH on removal effect, floc growth, strength, re-growth capability and fractaldimension. The optimum dosage was predetermined as 0.150 mmol/L, and excellent particle and organicmatter removal effect appeared in the pH range of 5.50-5.75. The structure characteristic of flocs formed atfour pH conditions were investigated by the analysis of floc size, effect of shear and particle scatteringproperties via a laser scattering instrument. The results indicated that flocs formed at neutral pH condition gavethe largest floc size and highest growth rate. The fractal dimension of flocs aggregates decreased in the lastminutes of the coagulation period, and larger flocs generally had smaller fractal dimensions. The floc strength,which was assessed by the relationship of floc diameter and velocity gradient, increased with the increase ofcoagulation pH. Flocs formed at pH 4.00 had better recovery capability when exposed to lower shear forces,while flocs formed at neutral and alkaline conditions performed better at higher shear forces.

摘要： The adjustment of pH is an important way to enhance removal efficiency in coagulation units, andin this process, the floc size, strength and structure can be changed, influencing the subsequent solid/liquidseparation effect. In this study, an inorganic polymer coagulant, polyferric chloride (PFC) was used in a lowdissolved organic carbon (DOC) and high alkalinity surface water treatment. This study examined theinfluence of coagulation pH on removal effect, floc growth, strength, re-growth capability and fractaldimension. The optimum dosage was predetermined as 0.150 mmol/L, and excellent particle and organicmatter removal effect appeared in the pH range of 5.50-5.75. The structure characteristic of flocs formed atfour pH conditions were investigated by the analysis of floc size, effect of shear and particle scatteringproperties via a laser scattering instrument. The results indicated that flocs formed at neutral pH condition gavethe largest floc size and highest growth rate. The fractal dimension of flocs aggregates decreased in the lastminutes of the coagulation period, and larger flocs generally had smaller fractal dimensions. The floc strength,which was assessed by the relationship of floc diameter and velocity gradient, increased with the increase ofcoagulation pH. Flocs formed at pH 4.00 had better recovery capability when exposed to lower shear forces,while flocs formed at neutral and alkaline conditions performed better at higher shear forces.

摘要： The adjustment of pH is an important way to enhance removal efficiency in coagulation units, andin this process, the floc size, strength and structure can be changed, influencing the subsequent solid/liquidseparation effect. In this study, an inorganic polymer coagulant, polyferric chloride (PFC) was used in a lowdissolved organic carbon (DOC) and high alkalinity surface water treatment. This study examined theinfluence of coagulation pH on removal effect, floc growth, strength, re-growth capability and fractaldimension. The optimum dosage was predetermined as 0.150 mmol/L, and excellent particle and organicmatter removal effect appeared in the pH range of 5.50-5.75. The structure characteristic of flocs formed atfour pH conditions were investigated by the analysis of floc size, effect of shear and particle scatteringproperties via a laser scattering instrument. The results indicated that flocs formed at neutral pH condition gavethe largest floc size and highest growth rate. The fractal dimension of flocs aggregates decreased in the lastminutes of the coagulation period, and larger flocs generally had smaller fractal dimensions. The floc strength,which was assessed by the relationship of floc diameter and velocity gradient, increased with the increase ofcoagulation pH. Flocs formed at pH 4.00 had better recovery capability when exposed to lower shear forces,while flocs formed at neutral and alkaline conditions performed better at higher shear forces.

摘要： The adjustment of pH is an important way to enhance removal efficiency in coagulation units, andin this process, the floc size, strength and structure can be changed, influencing the subsequent solid/liquidseparation effect. In this study, an inorganic polymer coagulant, polyferric chloride (PFC) was used in a lowdissolved organic carbon (DOC) and high alkalinity surface water treatment. This study examined theinfluence of coagulation pH on removal effect, floc growth, strength, re-growth capability and fractaldimension. The optimum dosage was predetermined as 0.150 mmol/L, and excellent particle and organicmatter removal effect appeared in the pH range of 5.50-5.75. The structure characteristic of flocs formed atfour pH conditions were investigated by the analysis of floc size, effect of shear and particle scatteringproperties via a laser scattering instrument. The results indicated that flocs formed at neutral pH condition gavethe largest floc size and highest growth rate. The fractal dimension of flocs aggregates decreased in the lastminutes of the coagulation period, and larger flocs generally had smaller fractal dimensions. The floc strength,which was assessed by the relationship of floc diameter and velocity gradient, increased with the increase ofcoagulation pH. Flocs formed at pH 4.00 had better recovery capability when exposed to lower shear forces,while flocs formed at neutral and alkaline conditions performed better at higher shear forces.

摘要： The adjustment of pH is an important way to enhance removal efficiency in coagulation units, andin this process, the floc size, strength and structure can be changed, influencing the subsequent solid/liquidseparation effect. In this study, an inorganic polymer coagulant, polyferric chloride (PFC) was used in a lowdissolved organic carbon (DOC) and high alkalinity surface water treatment. This study examined theinfluence of coagulation pH on removal effect, floc growth, strength, re-growth capability and fractaldimension. The optimum dosage was predetermined as 0.150 mmol/L, and excellent particle and organicmatter removal effect appeared in the pH range of 5.50-5.75. The structure characteristic of flocs formed atfour pH conditions were investigated by the analysis of floc size, effect of shear and particle scatteringproperties via a laser scattering instrument. The results indicated that flocs formed at neutral pH condition gavethe largest floc size and highest growth rate. The fractal dimension of flocs aggregates decreased in the lastminutes of the coagulation period, and larger flocs generally had smaller fractal dimensions. The floc strength,which was assessed by the relationship of floc diameter and velocity gradient, increased with the increase ofcoagulation pH. Flocs formed at pH 4.00 had better recovery capability when exposed to lower shear forces,while flocs formed at neutral and alkaline conditions performed better at higher shear forces.

摘要： The adjustment of pH is an important way to enhance removal efficiency in coagulation units, andin this process, the floc size, strength and structure can be changed, influencing the subsequent solid/liquidseparation effect. In this study, an inorganic polymer coagulant, polyferric chloride (PFC) was used in a lowdissolved organic carbon (DOC) and high alkalinity surface water treatment. This study examined theinfluence of coagulation pH on removal effect, floc growth, strength, re-growth capability and fractaldimension. The optimum dosage was predetermined as 0.150 mmol/L, and excellent particle and organicmatter removal effect appeared in the pH range of 5.50-5.75. The structure characteristic of flocs formed atfour pH conditions were investigated by the analysis of floc size, effect of shear and particle scatteringproperties via a laser scattering instrument. The results indicated that flocs formed at neutral pH condition gavethe largest floc size and highest growth rate. The fractal dimension of flocs aggregates decreased in the lastminutes of the coagulation period, and larger flocs generally had smaller fractal dimensions. The floc strength,which was assessed by the relationship of floc diameter and velocity gradient, increased with the increase ofcoagulation pH. Flocs formed at pH 4.00 had better recovery capability when exposed to lower shear forces,while flocs formed at neutral and alkaline conditions performed better at higher shear forces.

摘要： 经多年研试，无氰碱性镀铜在9个单位(7种线材、2种带材)实际连续生产，有的已近4a，其产品广泛应用在箱包钉、气枪钉、气保焊丝、护套线、电子元器件、电力电器等部门。文章对将无氰碱性镀铜在线材和带材上的应用作以介绍，供同行参考。

摘要： 经多年研试，无氰碱性镀铜在9个单位(7种线材、2种带材)实际连续生产，有的已近4a，其产品广泛应用在箱包钉、气枪钉、气保焊丝、护套线、电子元器件、电力电器等部门。文章对将无氰碱性镀铜在线材和带材上的应用作以介绍，供同行参考。

摘要： 经多年研试，无氰碱性镀铜在9个单位(7种线材、2种带材)实际连续生产，有的已近4a，其产品广泛应用在箱包钉、气枪钉、气保焊丝、护套线、电子元器件、电力电器等部门。文章对将无氰碱性镀铜在线材和带材上的应用作以介绍，供同行参考。

摘要： 经多年研试，无氰碱性镀铜在9个单位(7种线材、2种带材)实际连续生产，有的已近4a，其产品广泛应用在箱包钉、气枪钉、气保焊丝、护套线、电子元器件、电力电器等部门。文章对将无氰碱性镀铜在线材和带材上的应用作以介绍，供同行参考。

摘要： 一种pH调节器(1)，被配置成调节电解质水溶液的pH值，其包括具有阳极(21)和阴极(22)的电解槽(2)，阴极(22)包括法拉第准电容材料，其从阳极(21)获取电子并通过与所述阴离子进行电化学反应从电解质水溶液中吸附阳离子，电解质水溶液中的OH

摘要： 本发明提供可成为生理活性物质的介载体的、应答于弱酸性环境而表现膜破坏功能促进效果的pH敏感性载体及其制造方法、以及含有该载体的pH敏感性药物、pH敏感性药物组合物、及使用其的培养方法。所述pH敏感性载体表现膜破坏功能促进效果，包含：选自脱氧胆酸、胆酸、熊脱氧胆酸、鹅脱氧胆酸、猪脱氧胆酸、高级胆汁酸、甘氨脱氧胆酸、甘草酸、甘草亭酸及它们的盐中的至少一种pH敏感性化合物；和选自碳原子数10～12的磷脂酰胆碱、碳原子数12～18的聚氧乙烯山梨糖醇酐单脂肪酸酯、碳原子数16～18的失水山梨糖醇脂肪酸酯、单油酸甘油酯、二月桂酸甘油酯、二硬脂酸甘油酯、二油酸甘油酯、聚氧乙烯蓖麻油及α－生育酚中的至少一种两亲性物质。

摘要： 本发明公开了一种pH值调节单元、pH值调节装置及pH值调节控制方法，包括输液管、输液泵和pH值检测系统，输液管用于输出添加pH值调节液与待调节溶液混合；输液泵用于控制输液管的出液量；pH值检测系统用于检测待调节溶液的pH值，并与预设的目标pH值比较，控制输液泵输出添加pH值调节液。该pH值调节单元、pH值调节装置及pH值调节控制方法，通过pH值检测系统实时监测待调节溶液的pH值，并根据与目标pH值的差值大小，控制输液泵以不同的单一流速或快慢不一的流速输出添加pH值调节液，实现了自动滴定的控制效果，提高了调节效率；也可实现先快后慢的调节效果，避免目标pH值的错误判断，从而影响调节的准确性。

摘要： 本发明公开了一种pH值检测单元、pH值检测装置及pH值检测方法，包括pH值检测电极、温度传感器和控制系统，pH值检测电极用于检测溶液的电位并生成电位信息，温度传感器用于检测溶液的温度并生成温度信息，控制系统用于接收温度传感器的温度信息和pH值检测电极的电位信息，并采用pH缓冲溶液校正电极的初始pH值，根据测试样品溶液的电位、温度信息获得修正pH值。该pH值检测单元、pH值检测装置及pH值检测方法，通过温度传感器可以实时监测样品溶液的温度，通过控制系统根据pH缓冲溶液校正电极的初始pH值，根据样品溶液的电位和温度信息获得修正的pH值，实现了温度校正校正的功能，提高了pH值检测的准确度，提高了检测效率。

摘要： 本发明提供了一种pH值检测单元、pH值调节单元及pH值调节装置，涉及分析化学样品前处理领域。该pH值检测单元，其包括：pH值传感器、数据传输线、信号转换器和磁环，所述信号转换器的一端与所述pH值传感器电连接，所述信号转换器的另一端与所述数据传输线连接，所述磁环设置在所述信号转换器上并包裹所述信号转换器，所述磁环用于抑制磁场干扰，一种pH值调节单元，所述pH值调节单元包括：如上所述的pH值检测单元，所述pH值调节单元还包括输液管、pH值调节液选择阀、输液泵。在本方案中，通过在信号转换器设置磁环，能够屏蔽干扰信号，在高电压、高电频以及电磁干扰的条件下pH值检测单元可以减小信号波动，提高稳定性，保证pH值的准确性。

摘要： 本发明公开了一种pH胶囊、pH胶囊无线检测系统及食道pH监测方法，其中pH胶囊，包括pH传感器，所述pH传感器包括相连接的传感器主体和电路连接部，所述传感器主体设置于外壳外部。本发明显著减小了pH胶囊的体积，提高了pH胶囊天线的辐射效果，减小了pH传感器的激活时间并提高了传感器的响应速度。

摘要： 本公开的实施例提供了一种pH测量装置，包括：主体部分，包括在其中的中空部分以及形成在第一区域中以使得中空部分与外部连通的贯通部分；电极单元，包括参考电极和感测电极，所述参考电极和感测电极包括不同的材料并且被配置为通过使第一端位于所述中空部分中并且使与所述第一端相反的第二端通过所述贯通部分暴露于所述主体部分的外部来测量生物体中的pH；以及无线通信单元，其构造为将由电极单元感测的pH测量值发送到外部。

摘要： 本发明提供可成为生理活性物质的介载体的、应答于弱酸性环境而表现膜破坏功能促进效果的pH敏感性载体及其制造方法、以及含有该载体的pH敏感性药物、pH敏感性药物组合物、及使用其的培养方法。所述pH敏感性载体表现膜破坏功能促进效果，包含：选自脱氧胆酸、胆酸、熊脱氧胆酸、鹅脱氧胆酸、猪脱氧胆酸、高级胆汁酸、甘氨脱氧胆酸、甘草酸、甘草亭酸及它们的盐中的至少一种pH敏感性化合物；和选自碳原子数10～12的磷脂酰胆碱、碳原子数12～18的聚氧乙烯山梨糖醇酐单脂肪酸酯、碳原子数16～18的失水山梨糖醇脂肪酸酯、单油酸甘油酯、二月桂酸甘油酯、二硬脂酸甘油酯、二油酸甘油酯、聚氧乙烯蓖麻油及α－生育酚中的至少一种两亲性物质。

摘要： 一种pH调节器(1)，被配置成调节电解质水溶液的pH值，其包括具有阳极(21)和阴极(22)的电解槽(2)，阴极(22)包括法拉第准电容材料，其从阳极(21)获取电子并通过与所述阴离子进行电化学反应从电解质水溶液中吸附阳离子，电解质水溶液中的OH

摘要： 本发明涉及pH电极校准技术领域，提出了长期观测pH电极电位连续漂移补偿与pH动态计算方法，包括变步长自适应指数平滑动态预测方法，具体包括判断平滑系数α大小与误差平方和SSE的转折趋势，建立变步长搜索和多项式曲线拟合最小二乘法建立误差平方和SSE与平滑系数α连续函数关系，然后求解f'(α)＝0实现平滑指数α的动态快速寻优。通过上述技术方案，能够更快更准确的预测到电极漂移量，通过预测到的电极漂移量，能够对pH电极实际检测的响应电位进行校正，使用校正后的响应电位输入到能斯特方程运算，得出更为精准的pH值，实现pH电极免校准下的长期原位监测。