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        首頁 > 產品中心 > 品牌 > 代理 > International Humic 代理

        International Humic 代理

        簡要描述:International Humic代理——北京百奧創新科技有限公司,提供International Humic產品

        • 產品型號:型號齊全
        • 廠商性質:代理商
        • 更新時間:2023-10-19
        • 訪  問  量:1037
        詳情介紹


        International Humic 代理

        IHSS于1981年9月11日在美國科羅拉多州丹佛市成立,旨在匯集煤炭、土壤和水科學領域對腐殖物質感興趣的科學家。IHSS擁有近900名科學家。在促進科學教育和研究以及促進公眾對腐殖物質的了解方面,學會被gong認為世界領dao者。IHSS的座右銘是:“推進土壤和水中天然有機物的知識和研究"。該協會的目標包括建立和維持從褐煤、淡水、礦物土壤和有機土壤中收集腐殖酸和黃腐酸的標準樣品,以及收集表征數據。此外,協會還增加了作為研究腐殖物質來源的參考樣品。IHSS每兩年召開一次國際會議,匯聚來自土壤、煤炭、淡水和海洋科學的科學家。這些會議由主要科學家與IHSS委員會合作召開。

        .International Humic 代理

        ,International Humic產品列表:

        Cat. No.SourceCarboxylPhenolicQ1Log K1n1Q2Log K2n2NRMSE



        Sources: (1) School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, U.S.A.; (2) Department of Chemistry, Environmental Sciences Ph.D. Program, Ball State University, Muncie, IN, U.S.A.
        References: (1) J. D. Ritchie and E. M. Perdue, Geochim. Cosmochim. Acta, 67, 85-96 (2003); (2) S. J. Driver and E. M. Perdue, Advances in the Physicochemical Characterization of Dissolved Organic Matter: Impact on Natural and Engineered Systems, American Chemical Society, 1160: 75-86 (2014).

        Solutions containing 0.36 ± 0.01 g L-1 (on a dry ash-free basis) of an IHSS sample in 0.1 M NaCl were titrated from their initial pH values of 3.0-3.3 to final pH values of 10.5-10.7 in 25-35 minutes, using 6-8 mL increments of carbonate-free 0.100 M NaOH. All titrations were conducted under a N2 atmosphere in a thermostated water bath at 25.00 ± 0.02 °C. At least three titrations were obtained for each sample. The stock solutions of soil, peat, leonardite, and Summit Hill humic acids also contained 0.002 M NaOH, which was needed to effectively disperse/dissolve those samples, and an equivalent quantity of HCl that was added just before a titration was started.
        Carboxyl is the charge density (meq/g C) at pH 8.0; Phenolic is two times the change in charge density (meq/g C) between pH 8.0 and pH 10.0.
        The overall charge density (in meq/g C) of a humic substance increases systematically with pH (or with the concentration of H+). The equation on the right, known historically as a modified Henderson-Hasselbalch equation for two classes of binding sites, was used to fit titration data and obtain the set of model fitting parameters in this table.modified Henderson-Hasselbalch
        The fitting parameters of the model were obtained by a nonlinear least-squares fit of the model to aggregated sets of replicate titration data. Q1 and Q2 are the maximum charge densities of the two classes of binding sites, Log K1 and Log K2are the mean log K values for proton binding by the two classes of sites, and n1 and n2 are empirical parameters that control the width (in log K) of a class of proton binding sites. N is the number of fitted titration data points, and RMSE is the root mean-square error for fitting this model to the data (see Reference). This model, also known in more recent literature as a Langmuir-Freundlich equation, is the primary building block of the NICA class of models.
        An * means that a sample is no longer available, and nd means that an item was not determined.
        Standard HA
        Suwannee River I *1S101H(1)9.594.2410.694.423.792.289.681.111130.0673
        Suwannee River II2S101H(1)9.133.729.744.353.304.4810.441.731710.0815
        Elliott Soil1S102H(1)8.281.878.904.363.160.859.801.001690.0943
        Pahokee Peat1S103H(1)9.011.919.644.223.200.949.861.001450.0865
        Leonardite1S104H(1)7.462.318.174.593.321.139.721.311060.0532
        Standard FA
        Suwannee River I1S101F(1)11.442.9112.003.803.211.489.521.001090.1053
        Suwannee River II2S101F(1)11.172.8411.663.763.242.059.841.451230.1072
        Elliott Soil I *1S102F(1)ndndndndndndndndndnd
        Elliott Soil II2S102F(1)13.242.2714.123.673.620.749.531.001110.1375
        Pahokee Peat I *1S103F(1)13.342.3214.223.993.330.769.571.001170.1028
        Pahokee Peat II2S103F(1)ndndndndndndndndndnd
        Reference HA
        Suwannee River *1R101H(1)ndndndndndndndndndnd
        Pahokee Peat1R103H(1)8.872.059.544.263.251.019.851.001170.0773
        Nordic Lake1R105H(1)9.063.2310.324.324.221.649.891.111050.0740
        Summit Hill Soil1R106H(1)7.142.427.534.473.121.319.231.571060.0480
        Waskish Peat1R107H(1)ndndndndndndndndndnd
        Reference FA
        Suwannee River1R101F(1)12.233.1112.943.813.361.609.621.001150.1312
        Pahokee Peat *1R103F(1)15.241.7816.253.733.541.3110.741.001290.1586
        Nordic Lake1R105F(1)11.163.1812.153.793.951.499.671.001070.1121
        Waskish Peat1R107F(1)ndndndndndndndndndnd
        Pony Lake FA1R109F(2)7.091.756.914.521.921.439.481.7712560.0340
        Aquatic NOM











        Suwannee River I1R101N(1)9.853.9410.573.943.602.619.741.191120.0725
        Suwannee River II2R101N(2)11.212.4711.204.163.441.609.991.0317050.1360
        Nordic Lake1R108N(1)ndndndndndndndndndnd
        Upper Mississippi River1R110N(2)12.430.8312.513.472.690.9110.001.0016260.0800
        Bulk Materials











        Elliott SoilBS102M(1)ndndndndndndndndndnd
        Pahokee PeatBS103P(1)ndndndndndndndndndnd
        LeonarditeBS104L(1)ndndndndndndndndndnd



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