狠狠色丁香久久综合婷婷亚洲成人福利在线-欧美日韩在线观看免费-国产99久久久久久免费看-国产欧美在线一区二区三区-欧美精品一区二区三区免费观看-国内精品99亚洲免费高清

      

        

            










            
		
	
            

            
	    						                                                                                                        		                                              		
        
            北京百奧創(chuàng)新科技有限公司
            
		
		
            
			
		
		
            
	
            




            
    	
    	
            
		
		
            
			BUSINESS
			
            當(dāng)前位置：> 供求商機(jī)> International Hu-International Humic 代理
            
		
            
	
            

            

            
	
            
		
            
			
            [供應(yīng)]International Hu-International Humic 代理 
            
			
            
				
						  
			
            
			
            

				
            

														
            貨物所在地：國(guó)外
            
                                                        							
            更新時(shí)間：2024-11-14 09:26:28
            
							
            有效期：2024年11月14日 -- 2025年5月17日
            
							
            已獲點(diǎn)擊：215
            
				
            
				
				
				
            
					
            聯(lián)系我時(shí)，請(qǐng)告知來(lái)自 化工儀器網(wǎng)
            
				
            
							
            
		
            
	
            

            
	
            
		
            
			
            
				
						
				
            
					
					
            
						北京百奧創(chuàng)新代理International Humic在中國(guó)的業(yè)務(wù)。International Humic 代理，International Humic 代理，International Humic華東代理，International Humic華北代理，International Humic華中代理，International Humic華南代理
					
            
					
					
            
						
            北京百奧創(chuàng)新代理International Humic在中國(guó)的業(yè)務(wù)。International Humic代理，International Humic 代理，International Humic華東代理，International Humic華北代理，International Humic華中代理，International Humic華南代理，International Humic 代理
            Humic substances (HS) are complex and heterogeneous mixtures of polydispersed materials formed in soils, sediments, and natural waters by biochemical and chemical reactions during the decay and transformation of plant and microbial remains (a process called humification). Plant lignin and its transformation products, polysaccharides, melanin, cutin, proteins, lipids, nucleic acids, fine char particles, etc., are important components taking part in this process. Humic substances are involved in many processes in soils and natural waters: e.g., soil weathering, plant nutrition, pH buffering, trace metal mobility and toxicity, bioavailability, degradation and transport of hydrophobic organic chemicals, formation of disinfection by-products during water treatment, and heterotrophic production in blackwater ecosystems. Accordingly, humic substances have received attention from scientists in a wide variety of disciplines.International Humic 代理
            International Humic 代理，International Humic產(chǎn)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
            
					
            
                                                                				
				
            
			
            
		
            
	
            


     
    
	  				
							
    
    
    
    
    
    
    
	    
   	
    




        
        




    

    

    

	 
    
    				
			

		
    
    
    
    
    
    
    
    
    
    

    

     
     
     
	 



		 


            
	
            
		
            
			
            會(huì)員登錄
            
			×
		
            
		
            
				
            
					
            
						
						
            請(qǐng)輸入賬號(hào)
            
					
            
				
            
				
            
					
            
						
						
            請(qǐng)輸入密碼
            
					
            
				
            
				
            
					
            =
                       
            請(qǐng)輸驗(yàn)證碼
            
                    
            
				
            
				
            
		
            
	
            

            


            
	
            
		
            
			
            收藏該商鋪
            
			X
		
            
		
            
			
			
            該信息已收藏！
            
			
			
            
                
            
                    
            標(biāo)簽：
            
                    
            保存成功
            (空格分隔,最多3個(gè),單個(gè)標(biāo)簽最多10個(gè)字符)
            
                
            
                
            
                    
            常用：
            
                    
            
                
            
            
            
		
            
	
            

            


            
	
            
		
            
			
            提示
            
			X
		
            
		
            
			
            您的留言已提交成功！我們將在第一時(shí)間回復(fù)您~
            
		
            
	
            

            










            
    撥打電話
    產(chǎn)品分類

            
        
		
		
		
		
		
		
		
		


    

	
            
		在線留言