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0.02mol L-1SrCl2可作为一种土壤钾提取剂,但关于其提取机理、提取条件等问题还有待进一步研究。本研究选用10个土样试验,土样首先用0.02mol L-1 SrCl2连续提取7次,之后再用1mol L-1中性醋酸铵提取,从富含2∶1型粘土矿物地区采集的土样中1mol L-1中性醋酸铵可提取到13.9～120mg kg-1的钾,而从富含1∶1型粘土矿物的地区采集的土样中仅能提取到0～9.19mg kg-1的钾。当这些土样首先用1mol L-1中性醋酸铵提取7次后,再用0.02mol L-1SrCl2提取,0.02molL-1SrCl2仅能提取到0～3.61mgkg-1的钾。氯化锶提取液中加入氯化锂后,土壤钾的测定结果与中性醋酸铵法的测定结果及土壤钾的有效性间的相关性得到改善。以上结果表明,(1)2:1型粘土矿物中的某些钾可被中性醋酸铵提取,而不能被氯化锶提取剂提取;(2)抑制离子化有助于改善0.02mol L-1SrCl2提取液中的钾的测定结果。
0.02mol L-1SrCl2 can be used as a soil potassium extractant, but its extraction mechanism, extraction conditions and other issues remain to be further studied. In this study, 10 soil samples were selected and the soil samples were extracted seven times successively with 0.02 mol L-1 SrCl2 and then extracted with 1 mol L-1 neutral ammonium acetate. The soil collected from the area rich in 2: 1 type clay minerals In the sample, 1 mol L-1 neutral ammonium acetate extracted 13.9-120 mg kg-1 of potassium, whereas only 0-9.1 mg kg-1 of soil samples collected from areas rich in 1: 1 type clay minerals were extracted Of potassium. When these soil samples were extracted seven times with 1 mol L-1 neutral ammonium acetate and then extracted with 0.02 mol L-1SrCl2, only 0.02-3 mol L-1 potassium was extracted from 0.02 mol L-1SrCl2. After the addition of lithium chloride in the strontium chloride extract, the correlation between the determination results of the soil potassium and the determination results of the neutral ammonium acetate method and the soil potassium availability is improved. The above results show that (1) some potassium in 2: 1 type clay minerals can be extracted by neutral ammonium acetate and can not be extracted by strontium chloride extractant; (2) inhibition of ionization can help to improve 0.02mol L- Determination of potassium in 1SrCl2 extract.