I am isolating DNA from soil using a standard protocol and quantifying the DNA samples. While the concentrations are coming in acceptable range (up to 100 ng/ul), however, A260/230 ratio value is coming around 0.8-1, which is low, signifying the presence of impurities. I also checked the samples on 0.8% agarose gel, but could not find any band even after loading 10ul sample. Please help out to sort the issue, if anyone has faced a similar problem and troubleshooted.