共查询到18条相似文献，搜索用时 218 毫秒
1.
平台石墨炉原子吸收光谱法测定水中的重金属 总被引：3，自引：0，他引：3
居红芳 《常熟理工学院学报》2003,17(2):47-50
利用SIPF技术，直接测定水样中10种重金属元素，通过对灰化温度、背景扣除、基体改进剂等三方面的研究，得出了各被测重金属元素的最佳灰化温度，确定了测定海水或其它水样中重金属元素的方法，即用硝酸调节水样的PH值为1，在最佳灰化温度下，用D2扣除背景，用氩气作护气进行测定。该方法测定各重金属的加标回收率为91．3－108．4％，相对欲望 为3．49－9．12％，具有准确度和精确度高等优点。 相似文献
2.
ICP-AES法测定卤虫壳中的微量元素 总被引：3，自引：0，他引：3
报道了采用美国Leeman Labs公司生产的PS－I型中阶梯光谱仪，对卤虫壳中Ca、Mg、K、Na、Fe、Zn、P等微量元素的含量进行了测定，测定结果的相对标准偏差为0．651％－5．71％，回收率为：92．6％－97．3％。 相似文献
3.
用HNO3溶解试样，配制6种元素混合标准系列溶液，用空气－乙炔火焰原子吸收法连续测定Pb,Cd,Fe,Cu,Sb和Mn的含量。建立了优化的仪器测定条件，并进行了相关的干扰实验。方法的回收率为98.9%-102.0%，相对标准偏差为1.8%-2.5%。 相似文献
4.
采用硝酸-双氧水-高氯酸湿法消解样品，用ICP-AES同时测定中成药黄连上清片中的钾、铁、铬、砷、铅、锰、锌、铜等微量元素．建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定中成药黄连上清片中多种微量元素含量的方法．各元素回收率为89．4％～111．5％，变异系数为0．8％～4．5％．应用本方法测定实际样品，结果令人满意． 相似文献
5.
三辛基氧化膦化学修饰柏丝预富集—火焰原子吸收测定水中痕量铁 总被引：1，自引：0，他引：1
研究了用三辛基氧化膦（TOPO）化学修饰铂丝预富集－火焰原子吸收测定水中痕量Fe(Ⅲ）的方法，发现在HCl溶液中，用TOPO修饰的铂丝可以很好地富集痕量铁（Ⅲ），检出限为3．8ng/ml，线性范围为30－500ng/ml,20次平行测定相对标准偏差为5．33％。 相似文献
6.
火焰原子吸收法测定佛手瓜中钙镁铜锌 总被引：2，自引：0，他引：2
研究了用火焰原子吸收法测定佛手瓜中钙、镁、铜、锌等元素的方法。佛手瓜样品经湿法消化处理后,在最佳仪器条件下,对上述元素进行测定,钙、镁、铜和锌的回收率分别为98．9％、98．0％、97．1％及103．2％,相对标准偏差为0．34－1．40％。 相似文献
7.
标准加入原子吸收法连续测定镍粉中微量Co、Fe、 Cu、Ca、Mn、Zn、Mg和Pb的含量 总被引：1，自引：0，他引：1
用HNO3溶解试样，在几个相同量的试液中，分别加入浓度依次递增的8种元素的标准溶液，再加入释放剂SrCl2溶液，用空气—乙炔火焰原予吸收法连续测定Co、Fe、Cu、Ca、Mn、Zn、Mg和Pb的含量．建立了优化的仪器测定条件，并进行了相关的干扰实验．方法的回收率为98．4％—102．6％，相对标准偏差为1．2％—2．7％． 相似文献
8.
苯甲酸、山梨酸、糖精钠是常用的食品添加剂，但GB／T5009．28－1996检验方法仅对汽水，果汁、发酵食品中苯甲酸，山梨酸，糖精钠的测定方法作了规定，为了弥补GB／T5009．28－1996中的不足，章用高效液相色谱法（HPLC）对各类食品中上述物质含量的测定进行了探讨，并提出了用亚铁氰化钾、乙酸锌作为沉淀剂的前处理方法，通过实验得到了平均回收率为95．3％，标准曲线回归系数为0．999，平均相对标准偏差为2．5％的理想效果。 相似文献
9.
超细碳酸钙的制备与表征 总被引：2，自引：0，他引：2
分别以硅酸钠和硫酸锌为晶型控制添加剂，通过石灰乳碳化工艺制备超细CaCO3粉体。研究了添加剂用量对CaCO3颗粒尺寸的影响，并用TEM，XRD和TG－DTA对CaCO3粉体进行了表征。结果表明，添加0．7％－1．5％硅酸钠和0．5％－1．2％硫酸锌可分别制得颗粒尺寸为40－50m和40－60nm的球形和立方形超细CaCO3粉体。 相似文献
10.
全固定化试剂流动注射化学发光法测定银 总被引：1，自引：0，他引：1
将Luminol（Lu）、S2O8－Ag 化学发光反应体系中的发光剂Lu、S2O8用离子交换固定法固定在阴离子交换树脂上,串入流动注射系统中．当一定量的洗脱剂被注入阴离子交换柱时,洗脱下来的Lu和S2O8与分析物Ag 发生化学反应,产生化学发光,实现对Ag 的在线检测．此法检出限为1×10－8g／mLAg,线性范围为5×10－5－3×10－8g／mL,RSD为3．5％,单次测定在1分钟内能完成．已用于印相废液中银的测定,结果满意． 相似文献
11.
Physical punishment, childhood abuse and psychiatric disorders 总被引：1，自引：0，他引：1
OBJECTIVES: Physical punishment, as a means of disciplining children, may be considered a mild form of childhood adversity. Although many outcomes of physical punishment have been investigated, little attention has been given to the impact of physical punishment on later adult psychopathology. Also, it has been stated that physical punishment by a loving parent is not associated with negative outcomes; however, this theory has not been empirically tested with regard to psychiatric disorders. The main objective of the present study was to investigate three categories of increasing severity of childhood adversity (no physical punishment or abuse, physical punishment only, and child abuse) to examine whether the childhood experience of physical punishment alone was associated with adult psychopathology, after adjusting for sociodemographic variables and parental bonding dimensions. METHODS: Data were drawn from the nationally representative National Comorbidity Survey (NCS, n=5,877; age 15-54 years; response rate 82.4%). Binary logistic and multinomial logistic regression models were used to determine the odds of experiencing psychiatric disorders. RESULTS: Physical punishment was associated with increased odds of major depression (AOR=1.22; 95% CI=1.01-1.48), alcohol abuse/dependence (AOR=1.32; 95% CI=1.08-1.61), and externalizing problems (AOR=1.30; 95% CI=1.05-1.60) in adulthood after adjusting for sociodemographic variables and parental bonding dimensions. Individuals experiencing physical punishment only were at increased odds of adult psychopathology compared to those experiencing no physical punishment/abuse and at decreased odds when compared to those who were abused. CONCLUSIONS: Physical punishment is a mild form of childhood adversity that shows an association with adult psychopathology. 相似文献
12.
J E McCarroll J H Newby L E Thayer R J Ursano A E Norwood C S Fullerton 《Child abuse & neglect》1999,23(9):855-861
OBJECTIVE: To examine trends by year in reports of victims of child maltreatment in the US Army Central Registry (ACR) during the period 1975-97. We report the rates/1,000 children of Army families of initial substantiated cases from 1988-97 and the number of cases of maltreatment as a percentage of total victims for each year from 1975-97. Army data are compared to published reports from military service child abuse registries. METHODS: Numbers of cases of child maltreatment for each year were obtained from the ACR for major, minor, and total physical abuse, sexual abuse, emotional abuse, and neglect. Population figures for numbers of children were obtained from the Defense Manpower Data Center. RESULTS: The rates/1,000 for neglect have decreased by 24% from 1991-97, although the decrease has not been steady. The rates/1,000 of minor physical abuse declined 28% from 1993-97. The rates/1,000 of major physical abuse were basically unchanged from 1988-96, although the highest rate was recorded in 1997. The rates/1,000 of sexual abuse were also basically unchanged with the exception of increases in 1992-94 after which time the rates/1,000 returned to the pre-1992 levels. The rates/1,000 of emotional abuse cases more than doubled from 1988-97. CONCLUSIONS: While minor physical abuse and neglect have shown decreases over the past decade, major physical abuse has remained virtually unchanged and sexual and emotional abuse have shown fluctuations. All these forms of maltreatment are challenges to the Army Family Advocacy Program. 相似文献
13.
火焰原子吸收光谱法测定辣椒中的铁、锌、锰 总被引：1，自引：0，他引：1
用HNO_3+H_2O_2对样品进行湿法消解,采用火焰原子吸收光谱法测定辣椒中的Fe、Zn、Mn含量,经过多次筛选,最后确定了最佳仪器工作条件。该方法简便,精密度和灵敏度高,相对标准偏差为1.9～3.3%,回收率为86.52～94.45%。 相似文献
14.
《Child abuse & neglect》2014,38(11):1787-1793
Adverse childhood experiences (ACEs) have been linked with risky health behaviors and the development of chronic diseases in adulthood. This study examined associations between ACEs, chronic diseases, and risky behaviors in adults living in Riyadh, Saudi Arabia in 2012 using the ACE International Questionnaire (ACE-IQ). A cross-sectional design was used, and adults who were at least 18 years of age were eligible to participate. ACEs event scores were measured for neglect, household dysfunction, abuse (physical, sexual, and emotional), and peer and community violence. The ACE-IQ was supplemented with questions on risky health behaviors, chronic diseases, and mood. A total of 931 subjects completed the questionnaire (a completion rate of 88%); 57% of the sample was female, 90% was younger than 45 years, 86% had at least a college education, 80% were Saudi nationals, and 58% were married. One-third of the participants (32%) had been exposed to 4 or more ACEs, and 10%, 17%, and 23% had been exposed to 3, 2, or 1 ACEs respectively. Only 18% did not have an ACE. The prevalence of risky health behaviors ranged between 4% and 22%. The prevalence of self-reported chronic diseases ranged between 6% and 17%. Being exposed to 4 or more ACEs increased the risk of having chronic diseases by 2–11 fold, and increased risky health behaviors by 8–21 fold. The findings of this study will contribute to the planning and development of programs to prevent child maltreatment and to alleviate the burden of chronic diseases in adults. 相似文献
15.
Menick DM 《Child abuse & neglect》2001,25(1):109-121
OBJECTIVE: This study has investigated the prevalence of sexual abuse cases in Cameroon (Africa) and approached the way these cases are solved. METHOD: 405 medical certificates have been reviewed within a three years period. RESULTS: Over 405 medical certificates, 19 cases of sexual abuse have been identified. All the victims were girls. The great majority of them were aged 10-14 (57.9%) and 15-19 (31.6%). The sexual assaults have been perpetrated out of the family. CONCLUSION: The results show evidence of sexual abuse cases in Africa. Friendly adjustments by private contracts and family interventions with financial amends for the parents of the victims are often preferred to the court of justice, because of poverty, cultural pressures and judicial injunctions. 相似文献
16.
采用电感耦合等离子体质谱仪（ICP—MS）,同时测定了木瓜中的26种微量元素。结果表明木瓜中K、Na、Ca、Mg等元素的含量都比较丰富,并讨论了这些有益元素与人体健康的关系。该方法的回收率为96．5％-105．6％,RSD值为0．26％-2．03％,结果可信度高。该法精密度高、准确性好、干扰较少、快速简单,可用于质量控制。并为中药材木瓜中26种元素含量测定提供了方法。为进一步开发和利用木瓜提供了科学依据。 相似文献
17.
采用水蒸汽蒸馏法提取东阳西垣香榧的新鲜外种皮中的挥发油,总提取率为6．8％。并以气相色谱-质谱联用技术对其成分进行分析,从中分离出42个色谱峰,鉴定出了30种成分。相对含量超过1％以上的组分有11种,占总含量的90．46％,分别是柠檬烯39.38％,1R-α-蒎烯31．61％,β-水芹烯5．13％,（1S-顺）-1,2,3,5,6,8a-六氢-4,7-二甲基-1-（1-甲基乙基）-萘4．00％,大拢牛尔烯3．73％,β-蒎烯2．40％,茨烯2．11％,反-β-金合欢烯1．82％,异松油烯1．47％,可巴烯1．28％,2-异丙基-5-甲基-9-亚甲基-二环[4,4,0]1-癸烯1．26％。其中柠檬烯和α-蒎烯含量较文献报道高,实验为东阳西垣香榧外种皮的进一步开发利用提供了科学依据。 相似文献
18.
目的研究2,4-二甲氧基苯甲醛的合成.方法以间苯二酚为原料,用Gatternann-Adams法合成2,4-二羟基苯甲醛,再经硫酸二甲酯甲基化.结果总收率65.6%.结论在2,4-二羟基苯甲醛的甲基化的反应中,我们改变了传统的以氢氧化钠为碱,以水为溶剂的方法,收率有较大提高. 相似文献